LESSON 3
ANSWER KEY AND FEEDBACK
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.
110
FI0921
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