Discuss probability of the sample mean
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A sample of 100 is taken from a population which has a normal distribution with a mean of 80 and a standard deviation of 40.
Q: What is the probability that the sample mean is between 74 and 81 is?
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The area under the standard normal curve with parameters m = 64.4 and o= 2.4 that lies to the left of 61 is 0.0783.
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