SOLUTION: in any attempt to make a phone call to a rural school, the probability of 0,8 success exists, due to the existing connectivity challenges. Calculate the probability of attaining

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Question 1196305: in any attempt to make a phone call to a rural school, the probability of 0,8 success exists, due to the
existing connectivity challenges. Calculate the probability of attaining 7 successes in 10 attempts
Answer by ikleyn(52816) About Me  (Show Source):
You can put this solution on YOUR website!
.


            In your post,  write  highlight%280.8%29  for the probability instead of your mistakenly written  0,8. 


It is a typical binomial distribution probability problem.


Use the standard formula


    P(n=10; k=7; p=0.8) = C%5Bn%5D%5Ek%2Ap%5Ek%2A%281-p%29%5E%28n-k%29 = C%5B10%5D%5E7%2A0.8%5E7%2A%281-0.8%29%5E%2810-7%29 = %28%2810%2A9%2A8%29%2F%281%2A2%2A3%29%29%2A0.8%5E7%2A0.2%5E3 = 0.2013  (rounded).    ANSWER

Solved.