SOLUTION: The proportion of adults 25 and older in a certain country with at least a bachelor's degree is 0,25. Suppose you pick seven adults at random. What is the probability that exactl

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Question 1160746: The proportion of adults 25 and older in a certain country with at least a bachelor's
degree is 0,25. Suppose you pick seven adults at random. What is the probability
that exactly three will have a bachelor's degree or higher?
Answer by ikleyn(52817) About Me  (Show Source):
You can put this solution on YOUR website!
.

It is the binomial type probability distribution.


The number of trial n= 7; the probability of the success trial is  0.25,  and the number of success trial k = 3. 


    P = C%5B7%5D%5E3%2A0.25%5E3%2A%281-0.25%29%5E4 = %28%287%2A6%2A5%29%2F%281%2A2%2A3%29%29%2A0.25%5E3%2A0.75%5E4 = 0.173035.     ANSWER

Solved.