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Unformatted text preview: as 5% of the callers are put on hold for 4.8 minutes or longer, more operators should be hired. a. What proportion of the company's callers are put on hold for at least 4.8 minutes? Should the company hire more operators? b. At this company, 1% of the callers are put on hold for longer than k minutes. Find the value of k .  2  3. The weight of a product is normally distributed with a mean of four ounces and a variance of 0.25 "squared ounces." a) What is the probability that a randomly selected unit from a recently manufactured batch weighs more than 3.75 ounces? b) What is the probability that an average of 16 of these products weighs more than 4.5 ounces? 4. According to the Bureau of Census, 85.1% of adult residents of Arizona have completed high school. What is the probability that no more than 80% of the persons in a simple random sample of 200 adult residents in Arizona have finished high school?...
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 Fall '07
 Lv
 Normal Distribution, Standard Deviation, Variance, numerous phone calls, average annual purchases

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