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The probability density function of the random variable X is given by f ( x )=1/40 for 20 < x < 60 , and zero elsewhere

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The probability density function of the random variable X is given by f ( x )=1/40 for 20 < x < 60 , and zero elsewhere . The expected value , E ( X ) , of the random variable X is :

Select one :

a.5

b.28

c.15

d.30

e.None of the answers is correct