SOLUTION: A continous random variable X is normlly distributed with mean U>0 and variance 2U�.It is also known that Pr(x less than or equal to 20)=0.90 find the probability that 15 less tha

Question 1021895: A continous random variable X is normlly distributed with mean U>0 and variance 2U�.It is also known that Pr(x less than or equal to 20)=0.90
find the probability that 15 less than or equal to x less thn or equal to 25.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
we are given that .
Using a standard normal table, it follows that .
solving for , we get .
==> mean is 7 and variance is .
==>
=
= 0.9656 - 0.7910 =
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