Math check answer
posted by Nora 56
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.
Answer .161
(b) Compute the probability that at most four students are lefthanded.
Answer .129
(c) Compute the probability that at least six students are lefthanded.
Answer .193

bobpursley
a. what is .13^5 * .87^(315) >
Put .13^5 * .87^(315)= in your google search window.
b. at most four students...
add the probabliliy of one, two, three, four, and none are left handed.
Pr=.13^0*.87^31+.13^1*.87^30 + ...
c. at least six?
that is the same as 1 probability5orless
= 1 Pr(a)Pr (b) where pr(a), pr(b) is in part a, and b. 
Nora 56
I worked this out like you said above and got (a)9.936 (b)9.955 and both of them were wrong, any suggestions????
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