Choose the correct problem formulation: A Statistics Department is contacting alumni by telephone asking for donations to help fund a new computer laboratory. Past history shows that 80% of the alumni contacted in this manner will make a contribution of at least $50. A random sample of 20 alumni is selected. Let x represent the number of alumni that makes a contribution of at least $50. What is the probability that exactly 15 alumni will make a contribution of at least $50

0.1745

Step-by-step explanation:

We are given the following information:

We treat alumni contacted by telephone making a contribution of at least $50 as a success.

P(Alumni making a contribution) = 80% = 0.8

Then the number of alumni follows a binomial distribution, where

where n is the total number of observations, x is the number of success, p is the probability of success.

Sample size, n = 20

We have to evaluate:

Thus, 0.1745 is the probability that exactly 15 alumni will make a contribution of at least $50 when contacted by telephone.

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb