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Private investigation: Location People Old Friends Service is a company that finds the addresses of long-lost...

Private investigation: Location People Old Friends Service is a company that finds the addresses of long-lost friends. Private investigation claims to have a 70% success rate. You hire Private investigation to locate 12 of your past friends.

a) Compute μ, the expected number of old friends successfully located. (I got 8.4)

b) Compute σ, the standard deviation. (i got 1.587)

c) What is the likelihood that Old Friends locates exactly 5 of your past friends?

d) What is the likelihood that Old Friends locates at least 8 of your past friends?

e) What is the likelihood that Old Friends locates at most 4 of your past friends?

Math   Statistics-And-Probability   
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