MATHEMATICS

A manufacturer of television tubes has two types of tubes, A and B, respectively, the tubes have mean lifetimes of
xA = 1495 hours and xB = 1875 hours, and standard deviation of SA = 280 hours and SB = 310 hours. Which tube has the greater (a) absolute dispersion and (b) relative dispersion?

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  1. The weights of 10 boxes of a children brand of cereal have a mean content of 278 grams with an S.D of 9.64 grams. If these boxes were purchased at 10 different stores and the average price per box is $ 1.29 with an S.D of $ 0.09, can you conclude that the weights are relatively more homogeneous than the prices?

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