SOLUTION: Its is noted that 8% of school student are left handed. IF 20 students are randomly selected, calculate the (a) probability that none of them are left handed (b) probability that

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Question 928119: Its is noted that 8% of school student are left handed. IF 20 students are randomly selected, calculate the
(a) probability that none of them are left handed
(b) probability that at most 2 are left handed
(c) mean and standard deviation for the number of left handed students
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Previously Posted
p(left-handed) = .08, n = 20
Using a TI calculator 0r similarly a Casio fx-115 ES plus
P(x = 0LH) = binompdf(20, .08, 0)= .1887 0r = .92^20
P(x ≤ 2LH) = binomcdf(20, .08, 2)= .7879
mean = 1.6 s = sqrt(1.6*.92) = 1.2133