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September 16, 2014

September 16, 2014

Posted by **pallavi** on Tuesday, June 5, 2012 at 3:00am.

c=25,000+900x

there is a table which gives the completion time, in days, for theproject.

Completion time X (days) : Probability

10 : 0.1

11 : 0.3

12 : 0.3

13 : 0.2

14 : 0.1

Find the mean and variance for completion time X.

For mean which is E(x) : i got 11.9

Variance V(x): i got 176.7

standard deviation (x), i got 5.92

Now find the mean and variance for total cost C.

C=25,000+900x

Mean= c=25000 +900x

E(c)=E(25000+900)

=(25000+ 900 v(x)

25000 + 900x

E(x) =11.9

=25000+900 x 11.9

=357,10

but am having problem to find the variance??

help pls!

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