Weight Away, a company that sells weight-loss plans, often advertises the effectiveness of its plans by highlighting the stories of a few clients who have lost extraordinary amounts of weight. To get a better indication of the general effectiveness of the plans, we asked Weight Away to send us information about "typical" clients. Weight Away mailed us a brochure with the followinghistogram, which displays the weight loss (in pounds) over the past month for50

Weight Away clients. (Note that a negative value for weight loss represents a weight gain.)

12

10

8

6

4

2

0

Frequency

7

9

12

9

7

6

-1001020304050

Weight loss (in pounds)

Based on the histogram, estimate themeanweight loss (in pounds) for thissampleof Weight Away clients. Carry your intermediate computations to at least four decimal places, androundyour answer to at least one decimal place.