Question

Q6/

  Let X be a discrete random variable defined by the following probability function

x	2	3	7	9
f(x)	0.15	0.25	0.35	0.25

Give   P(4≤  X < 8)

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Q7/

Let X be a discrete random variable defined by the following probability function

x	2	3	7	9
f(x)	0.15	0.25	0.35	0.25

Let F(x) be the CDF of X. Give  F(7.5)

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Q8/

Let X be a discrete random variable defined by the following probability function :

x	2	6	9	13
f(x)	0.25	0.15	0.25	0.35

Give   E(X)

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Q9/ Let X be a discrete random variable defined by the following probability function :

x	1	5	7	11
f(x)	0.15	0.25	0.35	0.25

Give  Var(X).

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Q10 / (Let X be a discrete random variable with variance Var(X)=3. Find Var(4X +7

Answer 1