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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?
The manager of Sam's Food Mart guarantees that none of his cartons containing a dozen eggs will contain more than one bad egg, despite the fact that 4% of individual eggs are known to be bad. Define the random variable x to be the number of bad eg..
Suppose a company owns three cars that get 20 miles per gallon, two cars that get 22 miles per gallon and one car that gets 24 miles per gallon. Would the mean miles per gallon be 22?
Investigate the cost of a home mortgage and to determine the monthly payment.
If you arbitrarily grab 2 socks out of drawer determine the probability that you grab a matching pair?
Thermometers are normally distributed with a mean of O Celsius and a standard deviation of 1. OO Celsius, Find the probability that a randomly selected thermometer reads between - 2.23 and - 1.25 and draw a sketch of the region. The probability is..
Read the data from the fictitious research study regarding diabetes and alcohol consumption, and analyze and interpret the results.
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
Calculate η 2 , the percentage of variance accounted for by treatment.
The probability that the daily demand at this store is at least one and at most three is:
Use a .10 level of significance to test the claim that the variance of all scores in the population is more than 9.
At the .05 significance level, can we conclude that the guideline is still reasonable?
Assume that female students' heights are normally distributed with a mean given by µ = 64.2 in. and a standard deviation given by σ = 2.6 in.
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