Posted by **Julie** on Sunday, February 1, 2009 at 10:32pm.

A random variable N has a cumulative distribution function given by

F(x)={ 0 for x<1

0.2 for 1<=x<2

0.5 for 2<=x<3

0.8 for 3<=x<4

1 for 4<=x

Find the mean of N.

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