Z scores

Scores on a statistics final were normally distributed with a mean of 75 and a standard deviation of 8?

-What proportion of the scores were above 90?

-What proportion were below 65?

-What is the 22nd percentile of the score?


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Hi! :welcome: We are glad that you posted here! This looks like a homework question though. Our homework help policy can be found here. We mainly just want to see what you have tried so far and that you have put some effort into the problem. I would also suggest checking out this thread for some guidelines on smart posting behavior that can help you get answers that are better much more quickly.
This is a very elementary statistics problem. Your textbook should have a very clear procedural method in finding the answer.

Just take a look at the example problems in your textbook.