z = X - u = 2500 - 2370 = 130 = .35

σ

375

775

From table:

z = .35,

area = .1368

or 13.68%

Since this is the area between u and X, we must subtract it from 50% to get the shaded area:

50% - 13.68% = 36.32%

There is a 36.32% chance of exceeding 00.

(Reference: Frame 65.)

2.

z = 1995 - 2370 = -375 = -1.0

375

375

Using the Empirical rule, the area between u and X is 34%. Therefore, we would have a

shaded area of 50% - 34% = 16%. (Reference Frame 56.) Using the table, the area between u

and X is 34.13%, so the shaded area of interest would be 50% - 34.13% = 15.87%. (Reference

Frames 61-64.)

From the table, there is a 15.87% chance of getting an expense that is less than
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,995.

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