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25 December, 15:22

The tar contents of 8 brands of cigarettes selected at random from the latest list released by the federal Trade Commission is as follows: 7.3, 8.6, 10.4, 16.1, 12.2, 15.1, 14.5, and 9.3 milligrams. Calculate (

a. The mean; (

b. The variance.

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