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1.) scores on a test have a mean of 66 and a standard deviation of 9. michelle has a score of 57. convert michelles score

1.) scores on a test have a mean of 66 and a standard deviation of 9. michelle has a score of 57.

convert michelles score to a z-score.

I know the answer is -1 but can someone explain how to get -1?

2.) at one college, GPA's are normally distributed with a mean of 3 and a standard deviation of 0.6.

what percentage of students at the college have a GPA between 2.4 and 3.6?

i know the answer is 68% but can someone explain please.

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