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The manufacturer of an extended-life light bulb claims the bulb has an average life of 12,000 hours, with a standard deviation of 500 hours. If the distribution is bell shaped and symmetrical, what is the approximate percentage of these bulbs that will last
a. between 11,000 and 13,000 hours?
b. over 12,500 hours?
c. less than 11,000 hours?
d. between 11,500 and 13,000 hours?
List the experiments and random run orders if we are to run a fractional design and describe how you would analyse the data in each of the situations defined in (a) and (b) above.
Once these percentages have been calculated, how might the mean value of the all the numbers thrown be determined?
Given the following waiting time distribution in a hotel, compute the expected value of the waiting time in 2 dec pl.
If we know that the length of time it takes an MBA student to find a parking spot near the DePaul Center follows a normal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, find the probability that a randomly selected MBA ..
Managers are interested in modeling past cost behavior in order to make more accurate predictions of future costs. Models of past cost behavior are called cost functions. Factors that influence costs are called cost drivers (Horngren, Foster, and ..
Cornwell uses these forecasts for its production planning. It manufactures several types of glass, and demand is aggregated across products and measured in pounds.
In a test of the effectiveness of a new battery design, 16 battery-powered music boxes are randomly provided with either the old design or the new version. Hours of playing time before battery failure were as follows:
The world incidence of (frequency of world population having) diabetes is 5%. If 20 persons are chosen at random, what is the probability that no more than 3 have the disease
let x be the discrete r.v. with the following probability distribution.a calculate ex.b calculate micro.c calculate
Consider a multinomial experiment involving n = 300 and k = 5 cells. The observed frequencies resulting from the experiment are shown in the accompanying table, and the null hypothesis to be tested is as follows:
A large industrial firm allows a discount on any invoice that is paid within 30 days. Of all invoices, 10% receive the discount. In a company audit, 15 invoices are sampled at random. The mean (average) value of the number of the 15 sampled invoic..
three cards are randomly selected without replacement from an ordinary deck of 52 playing cards. compute the
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