Find the probability

Question

90% of married women claim to dislike their mother-in-laws. Suppose 8 married women are out to lunch. What is the probability that 5 of them dislike their mother-in-law

Answer 1

If the question is exactly 5:

 

You can consider this to be a binomial distribution with n=8, k=5, p=.9.

 

  use the formula C(8,5)(.9)⁵(.1)³ or look up the value in a binomial table  (ans=.033)

 

If the question is at least 5 then also using binomial table =.995

 

Any questions comment back.

Answer 2

90% of 5 in 8 women may dislike their mother-in-law, mathematically, (90/100) * (5/8) = 0.9 * 0.625 = 0.5625