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August 29, 2015

Homework Help: statistics

Posted by Colby on Sunday, July 6, 2014 at 1:32pm.

If you are told the mean grade in ECON 2023 is 80 with a standard deviation of 5, what is the probability that if you randomly selected 36 students you would find an average grade of 82 or more?

I found the Z-score: 82-80/5
Which gave me .6554 then 1-.6554=.3446

So 34% would make a 82 or more

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