Solution-The mean weight of 120 7th graders is 75 lbs with a

1a. The mean weight of 120 7th graders is 75 lbs with a standard deviation of 6 lbs. Calculate the standard error of the mean.+

6/sqrt(120) = .548

b. Using the mean and standard deviation from Q1a, calculate the proportion (percentage) of 7th graders that will have weights between 72 and 80 lbs?

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