Homework Answers
a)
P(3) = 1- P(2) - P(4)
= 1- 0.2 - 0.1
= 0.7
b)
P(X> =3) = P(3) + P(4)
= 0.7 + 01 = 0.8
c)
mean = summation (x*P(X))
= 2* 0.2 + 3* 0.7 + 4* 0.1
= 2.9
std.dev = summation (sqrt(x - mean)^2*P(x))
= (2-2.9)^2* 0.2 + (3-2.9)^2* 0.7 + (4-2.9)^2* 0.1
= 0.29
=sqrt(0.29) = 0.5385
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