A group of 20 values has a mean of 85 and a median of 80. A different group of 3

游客2025-02-23 53

问题 A group of 20 values has a mean of 85 and a median of 80. A different group of 30 values has a mean of 75 and a median of 72.
(a)What is the mean of the 50 values?
(b)What is the median of the 50 values?

选项

答案 (a)mean = 79
(b)The median cannot be determined from the information given.

解析

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A group of 20 values has a mean of 85 and a median of 80. A different group of 3

InhowmanydifferentwayscanthelettersinthewordSTUDYbeordered?5!=120

Howmanydifferentfive-digitpositiveintegerscanbeformedusingthedigits1

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Thereare7positiveintegersinthelist.Themedianofthelistis10,andthe

Fourdifferentpersonswillbeselectedfrom2menand5womentoserveonacom

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