2 the tar contents of 8 brands of cigarettes selected at


1. For the data of Exercise 4.4, calculate the vari- ance using the formula

(a) of form (4.2.1);

(b) in Theorem 4.1.

2. The tar contents of 8 brands of cigarettes selected at random from the latest list released by the Federal Trade Commission are 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.

3. 3.2	1.9	2.7	2.4	2.8 2.9	3.8	3.0	2.5	3.3 1.8	2.5	3.7	2.8	2.0 3.2	2.3	2.1	2.5	1.9  The grade-point averages of 20 college seniors se- lected at random from a graduating class are as follows:

For the given phosphate data, ?nd

(a) the mean;

(b) the median;

(c) the mode.

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