The length of time needed to complete a certain test is normally distributed with mean 23...
The length of time needed to complete a certain test is normally distributed with mean 23 minutes and standard deviation 11 minutes. Find the probability that it will take more than 20 minutes to complete the test.
Homework Answers
Solution :
Given that ,
mean = 
= 23
standard deviation = 
= 11
P(x > 20) = 1 - p( x< 20 )
=1- p P[(x -
) /
< (20 - 23) / 11 ]
=1- P(z < - 0.27)
Using z table,
= 1 - 0.3936
= 0.6064
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