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suppose the probability distribution for X = number of jobs held during the past year for...

suppose the probability distribution for X = number of jobs held during the past year for work study students at a university is as follows:

x= 0,1,2,3,4,5

f(x)=0.12, a, 0.28, 0.18, 0.06, 0.02

a. find a.

b. find the probability that a randomly selected student held three or more jobs during the past year.

c. find the cumulative distribution function.

d. find the E(X)

e. How many jobs would you expect a randomly selected student to hold in the past year?

Math   Statistics-And-Probability   
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