5.
This is the same as problem 4, except z = 1.96
a = u - zσ = 2370 - 1.96(375) = 1635
b = u + zσ = 2370 + 1.96(375) = 3105
6.
For this problem, the area between u and b is 90% - 50 = 40%. Therefore, z = 1.29 (see
problem 4) and b = 70 + 1.29 (5) = 53.75. Reference: Frame 71.)
7.
Same as problem 6, except the area between u and b is 951 - 50% = 45%. Therefore, z =
1.65 (.4500 or table between .4495 and .4505) and b = 70 + 1.65 (5) = 88.75.
(Reference: Frame 71.)
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FI0921
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