Consider a normal distribution curve where the middle 20 % of the area under the curve...
Consider a normal distribution curve where the middle 20 % of the area under the curve lies above the interval ( 7 , 20 ). Use this information to find the mean, ? , and the standard deviation, ?, of the distribution.
Homework Answers
From standard normal table:
P(-0.253 < z < 0.253) = 0.20
Hence,
(7 - 
)/
= -0.253
And
(20 -
)/
= 0.253
On solving above two equations, we will have:
7 + 0.253
= 20 - 0.253
= 25.69
= 7 + 0.253*25.69 = 13.5
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