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The length of time taken on the SAT for a group of students is normally distributed with a mean of 3 hours and a standard

The length of time taken on the SAT for a group of students is normally distributed with a mean of 3 hours and a standard deviation of 0.9 hours. A sample size of n = 40 is drawn randomly from the population. Find the probability that the sample mean is between 1.8 hours and 3 hours.

The probability is

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