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  3. A list of numbers has a mean of 8 and a standard deviation of 2.If x is a number in the list that is 2 standard deviations above

A list of numbers has a mean of 8 and a standard deviation of 2.If x is a number in the list that is 2 standard deviations above

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问题 A list of numbers has a mean of 8 and a standard deviation of 2.If x is a number in the list that is 2 standard deviations above the mean, what is the value of x ? x=______
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答案13
解析 You are given that x is 2 standard deviations above the mean, 8. Because the standard deviation of the numbers in the list is 2.5, it follows that x is(2)(2.5), or 5 units above the mean 8. Therefore, x = 8 + 5 = 13, and the correct answer is 13.
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