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Please help with steps on how to solve this The mean of the data for the...

Please help with steps on how to solve this

The mean of the data for the resting heart rate of adults is 72 beats per minute, and the standard deviation is 5 beats per minute. The results of the data were normally distributed. About what percentage of the population has a resting heart rate between 57 and 72?

The mean of normally distributed test scores is 81 and the standard deviation is 5. If there are 246 test scores in the data sample, how many of them were in the 86 to 91 range?

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