Determine the probability - mean and standard deviation, Mathematics

The scores of students taking the ACT college entrance examination are normally distributed with a mean m = 20.1 and a standard deviation s = 5.8.

A single student is selected at random. Determine the probability that their ACT score was between 18 and 24.

a) Determine the probability that a simple random sample of 25 students would earn an average score of at least 22.

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Uh on my homework it says 6m = $5.76 and I dont get it..

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