The personnel director of a large corporation wants to study absenteeism among

clerical workers at the corporation’s central office during the year. A random

sample of 25 clerical workers reveals the following:

Ø Absenteeism: = 9.7 days, *S* = 4.0 days.

12 clerical workers were absent more than 10 days.

- Set up a 95% confidence interval estimate of the population proportion of clerical workers absent more than 10 days last year.

A manufacturer of power tools claims that the average amount of time required to

assemble their top-of-the-line table saw is 90 minutes with a standard deviation of 40

minutes. Suppose a random sample of 64 purchasers of this table saw is taken. Find the

probability that the sample mean will be greater than 98 minutes?

** **

b) Given that *X* is a normally distributed random variable with a mean of 60 and a

standard deviation of 4, find the probability that *X* is between 57 and 64**. **

** **

(show working)

Subject | Mathematics |

Due By (Pacific Time) | 05/18/2013 10:00 am |

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