31.The mean of a normally distributed group of weekly incomes of a large group of executives is $2,000 and the
standard deviation is $120. What is the
z
score for an income of $1,900?
32. The weight of a product is normally distributed with a mean of four ounces and a variance of .25 "squared
ounces." The company wants to classify the unit as a good unit in a maximum of 98% of the units if the weight is
above a desired value. Determine the desired weight.
33. Assume that 55% of the actual voters in election for state governor support the incumbent governor (p = 0.55).
Calculate the probability of observing a sample proportion of voters 0.54 or less supporting the incumbent governor.
34. Bank tellers with six years of experience have a mean income of $38,000 per year. The known standard
deviation is $2,500. What is the probability that the mean income of a random sample of 35 tellers will be less than
$38,700?
35. You want to estimate the proportion of customers who are satisfied with their supermarket at level of confidence
of .92, and within .025 of the true value.
How large of a sample is needed?
36. You want to estimate the proportion of customers who are satisfied with their supermarket at level of confidence
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 Spring '10
 keys
 Finance, Statistics, Standard Deviation

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