20 percent of the employees in a company have managerial positions, and 30 percent of the employees in the company have MBA degrees. Also, 65 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employees who either have MBAs or are managers. (Round...

Health Insurance Coverage for Children A federal report stated that 88% of children under age 18 were covered by health insurance in 2000. How large a sample is needed to estimate the true proportion of covered children with 90% con dence with a con dence interval 0.05 wide?

A manufacturer makes two models of an item: model I, which accounts for 80% of unit sales, and model II, which accounts for 20% of unit sales. Because of defects, the manufacturer has to replace (or exchange) 10% of its model I and 18% of its model II. If a model is selected at random, find the...

The probability for a passenger not showing up is 5%. For this reason, AirCanada sells 205 tickets for a 200-seat airplane at $300cdn each. If the 201th passenger shows up, she will be refunded 300 plus a $500 compensation. The same for the 202nd and so on. AirCanada pockets all money from...

At a used-book sale, 100 books are adult books and 160 books are children s books. Of the adult books, 70 are nonfiction while 60 of the children s books are nonfiction. If a book is selected at random find the probability that it is

6.22 In each case, sketch the two specified normal curves on the same set of axes: A) A normal curve with U=20 and O=3, and a normal curve with U=20 and O= 6. (Bowerman. Custom book for Ashford: Essentials of Business Statistics. McGraw-Hill Primis Custom Publishing, 38503. 288)....

I'm still working on standard normal distribution probability using standard normal distribution table. Question: The average life of a particular battery is determined to be 56.2 hours with a standard deviation of 4.3 hours. Assume battery life is normally distributed batteries in the...

A coninuous type random variable x has the following cdf Fx (x) = {(0, x - /2 {a sin(x)+ b, - /2< x< /2 {1, elsewhere.) Determine a and b and find pdf of x. Determine the mean and variance of x. Let g(x)= 4x2 find the mean of...

A coninuous type random variable x has the following cumulative distribution function (cdf) Fx (x) = {(0, x - /2 { a sin(x)+b, - /2< x< /2 {1, elsewhere.) Determine a and b and find pdf of x. Determine the mean and variance of x....

The natural numbers are the possible values of a random variable x: that is, Xn = n, n=1,2,... These numbers occur with probabilities px (Xn)= pn, 0 < p < 1. 1) Show that p = is the only value of p that is allowed for the problem as formulated. [ Hint: the total probability...