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1. In a random survey of 3,015 boys age 11, the average height was 146 cm, and the standard deviation (SD) was 8 cm. A

1. In a random survey of 3,015 boys age 11, the average height was 146 cm, and the standard deviation (SD) was 8 cm. A histogram suggested the heights were approximately normally distributed.
09.7% of the data are within 3 standard deviations of the mean 95% within 2 standard deviations 68% within 1 standard deviation # + 20

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