A​ person's blood pressure is monitored by taking 44 readings daily. The probability distribution of his reading had a mean of 129 and a standard deviation of 33   a. Each observation behaves as a random sample. Find the mean and the standard deviation of the sampling distribution of the sample mean for the four observations each day.   b. Suppose that the probability distribution of his blood pressure reading is normal. What is the shape of the sampling​ distribution?   c. Refer to​ (b). Find the probability that the sample mean exceeds 140

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