math check
posted by Tom56 .
Suppose that you are in a class of 31 students and it is assumed that approximately 13% of the population is lefthanded. (Give your answers correct to three decimal places.)
(a) Compute the probability that exactly five students are lefthanded.
Incorrect: 9.936
(b) Compute the probability that at most four students are lefthanded.
Incorrect: .016.
(c) Compute the probability that at least six students are lefthanded.
Incorrect: .197
No matter how I work these out it comes up wrong??
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