SOLUTION: According to Harper's Index, 55% of all federal inmates are serving time for drug dealing. A random sample of 14 federal inmates is selected. (a) What is the probability that 9 o

Algebra ->  Probability-and-statistics -> SOLUTION: According to Harper's Index, 55% of all federal inmates are serving time for drug dealing. A random sample of 14 federal inmates is selected. (a) What is the probability that 9 o      Log On


   

Question 856994: According to Harper's Index, 55% of all federal inmates are serving time for drug dealing. A random sample of 14 federal inmates is selected.
(a) What is the probability that 9 or more are serving time for drug dealing? (Use 3 decimal places.)
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(b) What is the probability that 7 or fewer are serving time for drug dealing? (Use 3 decimal places.)

(c) What is the expected number of inmates serving time for drug dealing?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

 p = .55,  n = 14

P(x  ≥  9) = 1 - binomcdf(14,.55, 8)

P(x  ≤  7) = binomcdf(14,.55, 7)

expected is .55*14 = 7.7   0r approxiamately 8