Question

The probability that an individual has​ 20-20 vision is 0.15 0.15. in a class of 49 49 ​students, what is the probability of finding five people with​ 20-20 vision?

Answer 1

Answer: This is a Binomial problem where, n=49, p=0.15 and x=5

Therefore,

P(x=5) =
`nCx P^(x) (1-p)^(n-x)`

=
`49C5 (0.15)^(5) (1-0.15^(49-5)`

= 0.1135