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Suppose students' ages follow a normal distribution with a mean of 21 years old and a standard
deviation of 2 years. If we select a random sample of size n=25 students, what is the probability
that the sample mean age is between 20 and 22 years? Round your answer to four decimal
places.

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Suppose students ages follow a normal distribution with a mean of 21.pdf

  • 1. Suppose students' ages follow a normal distribution with a mean of 21 years old and a standard deviation of 2 years. If we select a random sample of size n=25 students, what is the probability that the sample mean age is between 20 and 22 years? Round your answer to four decimal places.