SOLUTION: 8% of student are left handed. if 20 student are randomly selected calculate i)probability that right handed ii)probability that at most 2 are left handed iii) mean and standard

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Question 856492: 8% of student are left handed. if 20 student are randomly selected calculate
i)probability that right handed
ii)probability that at most 2 are left handed
iii) mean and standard deviation for the number of left handed student
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

p(left-handed) = .08, p (right-handed) = 0.92,   n = 20

i)probability that right handed  .92

ii)probability that at most 2 are left handed: P(x ≤ 2)= binomcdf(20,.08,2)

iii) mean and standard deviation for the number of left handed student

    mean = .08*20 = 1.6 , SD = sqrt(1.6*.92) = 1.233

round off as directed.