Quiz Review
1. An experiment involves selecting a random sample of
256 middle managers at random for study. One item of
interest is their mean annual income. The sample mean is
computed to be $35,420 and the sample standard
deviation is $2,050. What is the standard error of the
mean?
A: $128.125
B: $138.36
C: $2,050
D: $8.01
2. The wildlife department has been feeding a special food
to rainbow trout fingerlings in a pond. A sample of the
weights of 40 trout revealed that the mean weight is 402.7
grams and the standard deviation 8.8 grams. What is the
probability that the mean weight for a sample of 40 trout
exceeds 405.5 grams?
A: 0.3783
B: 0.0228
C: 1.0
D: 0.5
3. The mean weight of trucks traveling on a particular
section of I475 is not known. A state highway inspector
needs an estimate of the mean. He selects a random
sample of 49 trucks passing the weighing station and finds
the mean is 15.8 tons, with a standard deviation of the
sample of 4.2 tons. What is probability that a truck will
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 Spring '10
 BARCUS

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