Assume the number of customers who order a dessert with their meal on a given night at a local restaurant has the probability distribution given below. The variance for the random variable x is _____. a. .77

Complete question :

X: 3, 4, 5, 6

f(x): .25, .55, .15, .05

Answer:

0.60

Step-by-step explanation:

Given the data:

Variance (s) :

Σx²*f(x) - E(x)²:

E(x) = (3*0.25) + (4*0.55)+(5*0.15)+(6*0.05) = 4

Σx²*f(x) - E(x)²: [(3^2 * 0.25)+(4^2 * 0.55)+(5^2 * 0.15)+(6^2 * 0.05)] - 4²

16.6 - 16 = 0.6

A recent article in the paper claims that business ethics are at an all-time low. Reporting on a recent sample, the paper claims that 31% of all employees believe their company president possesses low ethical standards. Suppose 20 of a company's employees are randomly and independently sampled and asked if they believe their company president has low ethical standards and their years of experience at the company. Could the probability distribution for the number of years of experience be modelled by a binomial probability distribution?

Dr. Pagels is a mammalogist who studies meadow and common voles. He frequently traps the moles and has noticed what appears to be a preference for a peanut butter-oatmeal mixture by the meadow voles vs apple slices are usually used in traps, where the common voles seem to prefer the appe slices. So he conducted a study where he used a peanut butten oatmeal mixture in half the traps and the normal apple slices in his remaining traps to see if there was a food preference between the two different votes
Indicate which of the following is the null hypothesis, and which is the alternate hypothesis
a. There food preferences among vole species are independent of one another.
b. There is a relationship between voles and food preference.
c. To test for independence, we need to calculate the Chi-square statistic.
These are the data that Dr. Pagels collected
meadow voles common voles
apple slices 15 21
peanut butter-oatmeal 25 16

someone please help!!!!!!!!!

estimate 3,156-2,163 by first rounding each number to the nearest hundred ​

given: if you go to the water park then you will need to bring sunscreen
given : if you do not bring sunscreen then you will burn
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which of the following choices is equal to 22+36

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Combine Like Terms. -13x + 14a - 12x + 7x - 4x *

Suppose you have some money to investfor ​simplicity, ​$1and you are planning to put a fraction w into a stock market mutual fund and the​ rest, ​, into a bond mutual fund. Suppose that​ $1 invested in a stock fund yields after 1 year and that​ $1 invested in a bond fund yields ​, suppose that is random with mean ​0.07(​%) and standard deviation ​, and suppose that is random with mean ​(​%) and standard deviation . The correlation between and is . If you place a fraction w of your money in the stock fund and the​ rest, ​, in the bond​ fund, then the return on your investment is .

What is the sum of (2x2 + 5x -3) and (-3x2 -10 + x2)​

Looking at the picture below, what are two things that you would correct about this student's posture and playing position if you were the teacher.
Please answer ASAP

Complete the point-slope equation of the line through (2,3)(7,4)
y-4=

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There are 252 players on 18 teams. How many players are on each team?

Solve for b.
p=9(b-5)

Please help with question plaaseeee

Please Help Fast! :(


Six teams are out on the field playing soccer. The teams all have the same number of players. The head coach asks for 2 players from each team to come help him move some equipment. Now there are 78 players on the field. Write and solve an algebraic equation whose solution is the number of players, p, on each team.

Please write the equation and answer please

A state forest service is conducting a study of the people who use state-operated camping facilities. The state has two camping areas, one located in the mountains and one located along the coast. The forest service wishes to estimate the average number of people per campsite during a popular weekend when all sites are expected to be used. There are 50 campsites in the mountains and 100 along the coast. From experience, the forest service knows that most sites in the mountains contain from 1-6 people and most sites along the coast contain from 1-10 people. Suppose the forest service can afford to conduct 20 interviews (e.g. they can select 20 campsites) (because they are asking many other questions in addition to number of people using the campsite and they want to do the interviews in person).
Using Neyman allocation, how would you suggest they allocate the 20 interviews among these 2 strata to minimize the standard error of the estimate of the overall average number of people per campsite?

Identify the coefficients: -3h - 2h + 6h +9

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HEY I NEED HELP ASAP!!!!!!!!!!!!!
this is the problem I need help with
n - 25/4 =3

What is the following equal to 7 times 10^3

answer quick 50 points

Help Please ????!!!?

1) 2,340/9=
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f(x) = 4x + 3 and g(x) = x - 2
Solve:
g(f(x)) =

You are playing a video game. For each diamond you collect, you earn 110 points. You also earn 80 bonus points by completing the level in less than 2 minutes. You need to earn more than 1620 points to continue on to the next level. Write and solve an inequality that represents the numbers d of diamonds you must collect in less than 2 minutes to advance to the next level.

6.13x7 approximate value
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A water feature that could be a source of groundwater for humans is found at a location on a hillside where Earth’s surface is lower than the water table.


Ill mark brainliest


What type of feature might be observed at this location?


spring

aquifer

artesian well

unsaturated zone