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The mean and standard deviation on a calculus mid term are 66 and 19 points while they are 72 and 15 on the final. If a student gets 75 points on the midterm, what is the comparable grade on the fin
Find the expected value (in dollars) of the amount won by one entry. Find the expected value (in dollars) if the cost of entering this sweepstakes is the cost of a postage stamp (34 cents)
A typing competency test yields scores which are normally distributed with a mean of 80 and a standard deviation of 10. Approximately what percentage of the test scores fall between 70 and 100?
What is the expected attendance? If tickets cost $20 each, the band will cost $300000, pluse $55000 for administration. What is the expected profit?
Consider the experiment of tossing two dice. Let Y denote the absolute dierence of the upturned faces. i.e. if X is the value on the first die and Z is the value on the second, then Y= |X-Z|
Find the probability that a data value picked at random from a normally distributed population will have a standard score that corresponds to the following: Less than 100.P(Z<100)
The FDA is comparing the mean caffeine contents of two brands of cola. Independent random samples of 6-oz. soda cans of each brand were selected and the caffeine content of each soda can was determi
Let x represent the absolute value of the difference between the number of heads and the number of tails when a coin is tossed 38 times.
In a study to estimate the proportion of residents in a city that support the construction of a new bypass road in the vicinity, a random sample of 1600 residents were polled. Let X denote the numbe
The time in hours for a worker to repair an electrical instrument is a Normally distributed random variable with a mean of ? and a standard deviation of 50. The repair times for 12 such inst
A political strategist calims that 55% of voters in Madison County support his candidate. In a poll of 200 randomly selected voters, 98 of them support the strategist's candidate. At a = .05, is the
Suppose that 17% of the undergraduates are seniors while the corresponding percentages for juniors, sophomores, and freshmen are 18%, 19%, and 46% respectively. What percent of the students use the
The purpose of this process is to ensure the defect rate is no more than 6%. Occasionally, by bad luck, even if the defect rate is no more than 6%, more than one defective tire is found from the cho
Customers arrived at the cashier counter according to a Poisson distribution at the average rate of 8 customers per hour. What is the average time (in minute) a customer would spend in the store?
The failure rate of each machine follows an exponential distribution with a mean time of ten hours and the time required to repair each machine follows an exponential distribution with a mean time o
The administrative cost of placing a costumer on backorder is estimated to be $10. The planned shortage inventory model recommends order quantity Q* = 74 and shortage level S = 20. What is the total
The production set up cost to use this machine is $200 and the production cost of tube is $.38. In Flavin estimates its holding cost rate for tube is 20%, what is the maximum inventory level (rounde
The lead time to receive order from Brightall is 10 days. Pantena Corp. operates 250 days a year. As such, Pantena Corp set the reorder point = 384. After considering the quantity discount and chang
Suppose Q* = 400. Now if the firm is willing to be out of stock of P-2001, an average of no more than two inventory cycles per year, what should be the reorder point (rounded to the nearest integer)
In the basic economic order quantity (EOQ) model, a doubling of estimated annual demand would lead to what change in Q*?
In the basic economic order quantity (EOQ) model, at Q* the estimated total annual holding cost:
An independent-measures research study uses two samples, each with n = 12 participants. If the data produce a t statistic of t = 2.50, what are the correct decisions for a two-tailed hypothesis test
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months.