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The time it takes students to complete an exam is Normally distributed with a mean of 45 minutes and a standard deviation of 4 minutes

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The time it takes students to complete an exam is Normally distributed with a mean of 45 minutes and a standard deviation of 4 minutes. Use this information to answer the following 2 questions.

If you take a sample of 30 students, what is the probability that the average amount of time needed to complete the exam for this group is more than 50 minutes? Write the answer as a percent, rounding to the nearest whole percent.