42

 PAGE: 770 SET: Exercises PROBLEM: 42

The set of data is .

Find the mean.

Add the numbers and then divide by the number of values in the data set.

(Divide: )

The mean is .

Find the variance.

Square the difference between each number and the mean.

Then add the squares, and divide by the number of values.

.                           (Divide: )

The variance is .

Find the standard deviation.

The standard deviation is the square root of the variance.

(Variance)

(Take the square root of the variance)

(Cancel the square root)

.                          (Use calculator)

The standard deviation is .

The mean is .

The variance is .

The standard deviation is .

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