math check

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Suppose that you are in a class of 31 students and it is assumed that approximately 13% of the population is left-handed. (Give your answers correct to three decimal places.)
(a) Compute the probability that exactly five students are left-handed.
Incorrect: 9.936

(b) Compute the probability that at most four students are left-handed.
Incorrect: .016.

(c) Compute the probability that at least six students are left-handed.
Incorrect: .197
No matter how I work these out it comes up wrong??

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