Exercise 6 Page 341

We have been told that the masses of pennies minted in the U.S. after

1982

2.50 g

0.02 g .

We will find the percentages of pennies that have a mass between

2.44 g

and

2.56 g .

2.44 < x < 2.56

First, let's find the difference between the mean,

2.50 g,

and the lower limit,

2.44 g,

in terms of standard deviations. To do that, we will subtract the lower limit from the mean.

2.50 g - 2.44 g = 0.06 g