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The reading speed of second graders is approximately normal, with a mean of 90 words per...

The reading speed of second graders is approximately normal, with a mean of 90 words per minute and a standard deviation of 10 words per minute.
a) Find the probability a random sample of 25 students would have a mean reading speed of more than 95 words per minute?

b) Find the probability a random sample of 25 students would have a mean reading speed between 85 and 90 words per minute

Math   Statistics-And-Probability   
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