(Answered) A professor wants to use the mean of a random sample to

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A professor wants to use the mean of a random sample to estimate the average amount of time students take to do their homework. She wants to be able to assert with a probability of 0.99 that her error will be at most 10 minutes. If you can assume σ = 30 minutes, state the size of sample, n, she will need to use, or state what additional would be necessary to find this value.

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