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In the Hanes5 sample, the average height of the boys was 137 cm atage 9 and 151 cm at age 11. At age 11, the

In the Hanes5 sample, the average height of the boys was 137 cm atage 9 and 151 cm at age 11. At age 11, the average height ofall the children was 151 cm.

a) on the average, are boys taller than girls at age 11?

b) Guess the average height of the 10-year-old boys.

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