It is known that 5% of flashlight bulbs manufactured by a certain company are defective. a. Use the normal approximation to estimate the probability that, out of a random sample of 600 lightbulbs, at least 25 are defective. (5 points) b. Use the normal approximation to estimate the probability that, out of a random sample of 600 lightbulbs, fewer than 20 are defective. (5 points)

Answer:

The sample size is       [tex]n  =  246[/tex]

Step-by-step explanation:

From the question we are told that

    The standard deviation is [tex]\sigma  =  4\ lb[/tex]

    The confidence level is  C  = 95%

    The total  width is  [tex]w = 1 \  lb[/tex]

Given that the confidence level is  95% then the level of significance is mathematically represented as

       [tex]\alpha = (100 -95 )\%[/tex]

=>    [tex]\alpha = 0.05[/tex]

From the normal distribution table  the critical value  for  [tex]\frac{\alpha }{2}[/tex] is  

    [tex]Z_{\frac{\alpha }{2} } =  1.96[/tex]

Generally the sample size is mathematically represented as

       [tex]n  =  [\frac{Z_{\frac{\alpha }{2}}  * \sigma }{E}]^2 [/tex]

Here E is the margin of error which is mathematically represented as

     [tex]E =  \frac{w}{2}[/tex]

=>   [tex]E =  \frac{1}{2}[/tex]

=>   [tex]E = 0.5 [/tex]

So

      [tex]n  =  [\frac{1.96 * 4 }{0.5}]^2 [/tex]

    [tex]n  =  246[/tex]

Answer:

7 - - 5 = 12

Step-by-step explanation:

Answer:

7+5=12

Step-by-step explanation:

even numbers of negatives alwasy equal positive

Answer:

+7 will be the opposite or reciprocal of -7

Step-by-step explanation:

Hope it Helps!!!!

The opposite of the number, -7, is its reciprocal, which is: 7.

The opposite of a number is its reciprocal or the value on the number line that would occupy the same distance from zero in the opposite direction.

For example, opposite of b is -b.

The reciprocal of -7 is 7. Therefore, the opposite of the number, -7 is: 7.

Learn more about opposite of a number on:

https://brainly.com/question/2206063

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Answer:

19 term

Step-by-step explanation:

you need to know the expression ... these three dots, first

not easy

(77-5)/4+1=19

Answer:

19 terms

Step-by-step explanation:

terms = 5,9,13,17,21,25,29,33,37,41,45,49,53,57,61,65,69,71,73,77

Answer:

Your answer is 4 Years!

Answer: 4 Years

Step-by-step explanation: Just to confirm the other person it is 4 years!

Answer:

150

Step-by-step explanation:

If 7-5=2 books cost 300 and you want to find the cost of 1 book, you would need to divide that 300 by 2.

300÷2=150

Answer:

Step-by-step explanation:

Answer:

we need the coordinates really. I can tell you that for any 2 coordinates the distance between them can be found using the Distance formula D=sq. rt (x1-x2)^2 + (y1-y2)^2

Answer:

-1

Step-by-step explanation:

mean means the average. so, add together all the given data, which you will get -7, then divide by the amount of data given, which is 7, and you will get -1

P > -1

Step-by-step explanation: i have the exact same quiz

Answer:      12*x-7-(13*(x-12)*x)=0

Step by Step Solution

More Icon

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    12*x-7-(13*(x-12)*x)=0

Step by step solution :

STEP

1

:

Equation at the end of step 1

 (12x - 7) -  (13 • (x - 12) • x)  = 0

STEP

2

:

Equation at the end of step 2

 (12x - 7) -  13x • (x - 12)  = 0

STEP

3

:

STEP

4

:

Pulling out like terms

4.1     Pull out like factors :

  -13x2 + 168x - 7  =   -1 • (13x2 - 168x + 7)

Trying to factor by splitting the middle term

4.2     Factoring  13x2 - 168x + 7

The first term is,  13x2  its coefficient is  13 .

The middle term is,  -168x  its coefficient is  -168 .

The last term, "the constant", is  +7

Step-1 : Multiply the coefficient of the first term by the constant   13 • 7 = 91

Step-2 : Find two factors of  91  whose sum equals the coefficient of the middle term, which is   -168 .

     -91    +    -1    =    -92

     -13    +    -7    =    -20

     -7    +    -13    =    -20

     -1    +    -91    =    -92

     1    +    91    =    92

     7    +    13    =    20

     13    +    7    =    20

     91    +    1    =    92

Observation : No two such factors can be found !!

Conclusion : Trinomial can not be factored

Equation at the end of step

4

:

 -13x2 + 168x - 7  = 0

STEP

5

:

Parabola, Finding the Vertex:

5.1      Find the Vertex of   y = -13x2+168x-7

Parabolas have a highest or a lowest point called the Vertex .   Our parabola opens down and accordingly has a highest point (AKA absolute maximum) .    We know this even before plotting  "y"  because the coefficient of the first term, -13 , is negative (smaller than zero).

Each parabola has a vertical line of symmetry that passes through its vertex. Because of this symmetry, the line of symmetry would, for example, pass through the midpoint of the two  x -intercepts (roots or solutions) of the parabola. That is, if the parabola has indeed two real solutions.

Parabolas can model many real life situations, such as the height above ground, of an object thrown upward, after some period of time. The vertex of the parabola can provide us with information, such as the maximum height that object, thrown upwards, can reach. For this reason we want to be able to find the coordinates of the vertex.

For any parabola,Ax2+Bx+C,the  x -coordinate of the vertex is given by  -B/(2A) . In our case the  x  coordinate is   6.4615  

Plugging into the parabola formula   6.4615  for  x  we can calculate the  y -coordinate :

 y = -13.0 * 6.46 * 6.46 + 168.0 * 6.46 - 7.0

or   y = 535.769

Answer:

12

Step-by-step explanation:

P = is you add Length (L) plus Legnth (L) plus Width (W) plus Width (W)

4+4+2+2

6d + 5 = c

hope that helps :)

Given that,

θ € 4th quadrant

3π/2 < θ < 2π

sin θ = - 1/2

sin²θ + cos²θ = 1

[ -1/2] ² + cos²θ = 1

1/4 + cos²θ = 1

cos²θ = 1 - 1/4

cos²θ = 4 - 1 / 4

cos²θ = 3/4

As,

θ € 4th quadrant = cos θ > 0

cosθ = √3/2

tan θ = 1/2 ÷ √3/2

tan θ = - 1/√3

cosec θ = 1/sin θ = -2

sec θ = 1/cos θ = 2√3

Step-by-step explanation:

First you add the number of used and unused feets of foil

223 + 77 = 300

After that you divide the feets of rolls by the total number of foils

that is, 300 / 6 = 50

therefore there are 50 feets in each foil

if this helped pls give brainliest

Answer:

5

Step-by-step explanation:

We would like to find out the value of [tex] x + y + z [/tex] from the given equations , which are ;

[tex]\longrightarrow \dfrac{1}{x}+\dfrac{1}{y}+\dfrac{1}{z}=0[/tex]

[tex]\longrightarrow \\ x^2+y^2+z^2=25[/tex]

Now consider ,

[tex]\longrightarrow \dfrac{1}{x}+\dfrac{1}{y}+\dfrac{1}{z}=0\\[/tex]

[tex]\longrightarrow \dfrac{xy + yz + zx }{xyz }=0\\[/tex]

[tex]\longrightarrow xy + yz + zx = 0(xyz)\\ [/tex]

[tex]\longrightarrow xy + yz + zx = 0\\ [/tex]

[tex]\longrightarrow 2(xy + yz + zx)=0(2)\\[/tex]

[tex]\longrightarrow 2(xy + yz + zx)=0[/tex]

Now recall the identity ,

[tex]\longrightarrow (a + b + c)^2=a^2+b^2+c^2+2(ab + bc + ca)[/tex]

Plug in the values ,

[tex]\longrightarrow (x+y+z)^2= 25 + 0\\ [/tex]

[tex]\longrightarrow (x + y + z )^2=25\\[/tex]

[tex]\longrightarrow (x + y + z)=\sqrt{25}\\[/tex]

[tex]\longrightarrow \underline{\underline{\boldsymbol{ x + y + z = 5}}}{} [/tex]

And we are done !

Answer :

⠀

Step-by-step explanation:

Given,

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ \dfrac{1}{x} + \dfrac{1}{y} + \dfrac{1}{z} = 0}}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {x}^{2} + {y}^{2} + {z}^{2} = 25 }}}}[/tex]

⠀

To Find :

[tex]{ \longrightarrow \qquad{ { \sf{ x + y + z }}}}[/tex]

⠀

Solution :

[tex]{ \longrightarrow \qquad{ { \sf{ \dfrac{1}{x} + \dfrac{1}{y} + \dfrac{1}{z} = 0}}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ \dfrac{yz + zx + xy}{xyz} = 0}}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {yz + zx + xy} = 0}}}}[/tex]

⠀

Multiplying both sides by 2 :

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ 2( {yz + zx + xy} )= 0.2}}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ 2( {yz + zx + xy} )= 0}}}}[/tex]

⠀

We know,

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {(x + y + z)}^{2} = {x}^{2} + {y}^{2} + {z}^{2} + 2(xy + yz + zx) }}}}[/tex]

⠀

As, It is given that,

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {x}^{2} + {y}^{2} + {z}^{2} = 25 }}}}[/tex]

⠀

and as we get,

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ 2( {yz + zx + xy} )= 0}}}} \\ \\{ \longrightarrow \qquad{ { \sf{ 2( {xy + yz + zx} )= 0}}}}[/tex]

⠀

Now, We'll substitute it in the formula :

[tex]{ \longrightarrow \qquad{ { \sf{ {(x + y + z)}^{2} = 25 + 0 }}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {(x + y + z)}^{2} = {25} }}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \sf{ {x + y + z}^{} = \sqrt{25} }}}}[/tex]

⠀

[tex]{ \longrightarrow \qquad{ { \bf{ \pmb {x + y + z}^{} = {5} }}}}[/tex]

⠀

Therefore,

Answer:

24 for being able to not have one, 6 for having one of each

Step-by-step explanation:

multiplication

with the option of none

4*2*3=24

without the option of none

3*1*2=6

Answer:

no they are not similar

Step-by-step explanation:

8/12 does not reduce to the same amount that 6/8 and 12,16

Domain is the x-intercept(first number) for example if I were told to find the domain in (1,3)(4,7)(8,9) the domain would be 1,4, and 8 because they're the x-factors and then plotting a point, the x-factors come first.

Range is the y-factors(second number) and given an example above, the ranges would be 3,7, and 9 because when plotting, they are the second number.

You can tell if it is a function or not if the X-factors repeat. For example, the first one is NOT a function because the 2 repeats for the x-factor. Number 2 IS a function because the x-factor doesn't repeat.

Sorry if this doesn't make sense, that's the best way I can explain!

Answer:

A quadrilateral's interior angles have a sum of 360°.

Given that we have 85°, 100°, and 90°(the right angle), and an unknown angle.

We can add these angles plus the unknown angle to equal a total of 360°.

85 + 100 + 90 + x(our unknown missing angle) = 360

simplify

275 + x = 360

Isolate x by subtract 275 from both sides;

-275       -275

x = 85, ∠1 = 85°

We can also double check:-

85 + 100 + 90 + 85 = 360

360 = 360 which is correct.

Answer:

Slope of top rail f(x) is 7

Slope of top rail g(x) is 7

Top and bottom rails are parallel.

Step-by-step explanation:

The table shows the  distance, in inches, of the top rail f(x) and bottom  rail g(x) from the floor for the middle of each  numbered stęp x.

x        f(x)      g(x)

1          9        43

2          16        50

3          23        57

To find the slope of top rail :

x        f(x)      

1          9        

2          16        

3          23        

[tex](x_1,y_1)=(1,9)\\(x_2,y_2)=(2,16)\\Slope = m = \frac{y_2-y_1}{x_2-x_1}=\frac{16-9}{2-1}=7[/tex]

Slope of top rail f(x) is 7

To Find the slope of bottom rail:

x     g(x)

1      43

2      50

3      57

[tex](x_1,y_1)=(1,43)\\(x_2,y_2)=(2,50)\\Slope = m = \frac{y_2-y_1}{x_2-x_1}=\frac{50-43}{2-1}=7[/tex]

Slope of top rail g(x) is 7

We know that if the slopes of two lines are equal then are said to be parallel lines

Since the slopes of both the rail are equal . So, Top and bottom rails are parallel.

1)

First 2 triangles can be proven similar but are not necessarily congruent since you can't from them using the side-angle-side or angle-side-angle or triple side rule.

2)

ONM = QNP since they are vertically opposite angles.

MON = NPQ given equal on the figure

ON=NP given

The two triangles are proven congruent using the angle-side-angle property.

3)

Last 2 pairs cannot be proven congruent as there is not enough info.

Using the normal probability distribution and the central limit theorem, it is found that there is a 0.0207 = 2.07% probability that the sample proportion of baseball players will be greater than 63%.

In a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the z-score of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

In this problem, we have that:

The mean and the standard error are given by:

[tex]\mu = p = 0.59[/tex]

[tex]s = \sqrt{\frac{p(1 - p)}{n}} = \sqrt{\frac{0.59(0.41)}{632}} = 0.0196[/tex]

The probability that the sample proportion of baseball players will be greater than 63% is one subtracted by the p-value of Z when X = 0.63, hence:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

By the Central Limit Theorem

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{0.63 - 0.59}{0.0196}[/tex]

[tex]Z = 2.04[/tex]

[tex]Z = 2.04[/tex] has a p-value of 0.9793.

1 - 0.9793 = 0.0207.

0.0207 = 2.07% probability that the sample proportion of baseball players will be greater than 63%.

To learn more about the normal probability distribution and the central limit theorem, you can check https://brainly.com/question/24663213

Answer:

The answer I got was wrong, but I have a solution process, at least.

Step-by-step explanation:

600*48.57+1150*46.10+250*53.46-2000*35.49

=21942+53015+13365-70980

=17342

Now we need to subtract the commission that Cynthia is paying her broker. $88 per $1000 means Cynthia owes her broker 17*88=$1496. Now we subtract that from 17342 to get $15,846.

Answer:its A. $9,889.82

Step-by-step explanation:

Answer:

2x3x7

Step-by-step explanation:

Because that's what you have to multiply giving you 42

Answer:

7×2×3

Step-by-step explanation:

Answer:

B) Line 2

using the formula:

[tex]\sf c^2 = a^2 + b^2 -2abcos(C)[/tex]

[tex]\sf c^2 = 14^2 + 8^2 -2(14)(8)cos(80)[/tex]

[tex]\sf c^2 = 196 + 64 -244 *0.173[/tex]

[tex]\sf c^2 = 221.1[/tex]

[tex]\sf \sqrt{c} = \sqrt{221.1}[/tex]

[tex]\sf c = 14.87[/tex]

Use law of cosines

Error at line 2

Answer:

k=0 or 4

Step-by-step explanation:

[tex]y=x^2+(k+4)x+3k+4\\=x^2+(k+4)x+(\frac{x+4}{2})^2 +3k+4-(\frac{x+4}{2})^2\\=(x+\frac{x+4}{2})^2+3k+4-(\frac{x+4}{2})^2\\[/tex]

so the vertex is at

[tex](-\frac{k + 4}{2}, 3k+4-(\frac{x+4}{2})^2)[/tex]

The vertex lies in the x-axis, so

[tex]3k+4-(\frac{k+4}{2})^2 = 0\\4(3k+4)-(k+4)^2=0\\12k+16-k^2-8k-16=0\\-k^2+4k=0\\-k(k-4)=0\\k-0, 4[/tex]

Answer:

3(5-2x) = 2(4x=3)

= 15-6x = 8x=6

= 15-6x = 8x-6

= 15-6 = 8x+6x

= 9 = 14x

therefore, x=9/14

Step-by-step explanation:

hope it helps you

Answer:

[tex]b^{3}[/tex]

Step-by-step explanation:

I hope this helps!