Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is Normal. Use 3 digits after decimal point.
Probability that sample mean S² less than 231.46 is _______?
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Use 3 digits after decimal point. Probability that sample mean S2 less than 231.46 is . ... size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively.
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