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A large group of people are part of a study. Thirty people have weights in the range of 110-130 pounds, seventy are in the range

A large group of people are part of a study. Thirty people have weights in the range of 110-130 pounds, seventy are in the range 130-150, twenty are in the range 150-170, and thirty are in the range 170-190.The weights are spread fairly evenly in these ranges.

a. True or False: The SD for this data is larger than 39 pounds.

b. Give the 80th percentile for this data and explain.

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