A normally distributed population has a mean of 88 and a standard deviation of 10. When a sample of size 36 is taken, the sample mean-was found to be 91. Another sample of size 36 is taken, and its sample mean was found to be 87. What is u-? O A. 89 O B. 91 O C. 87 O D. 88.667 O E. 88

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