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A new extended lightbulb has an average service life of 750 hours. With a standard deviation of 50 hours. If the service life of these bulbs approximates a normal distributions, about which percent of the bulbs will last between 600 hours and 900 hours?
A school only accepts students with the top 20% of sat scores. The sat has a mean of 500 and a standard deviation of 100. what actual score should be used as the cut-off score?
testing for population mean.the average fee charged by a large accounting firm to prepare an individual income tax
Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.
testing for equality of mean.1. a computer is programmed to make 100 draws at random with replacement from the box
To forcast the sample size within 0.02 with 90 percent confidence. The CEO of the organization needs to forcast the proportion of Canadians who own their house.
a population of cereal boxes has a normal weight with a mean of 16 ounces and a standard deviation of 0.2 ounces. if a
a nursing school wants to estimate the true mean annual income of its alumni. it randomly samples 120 of its alumni.
members of the senate took a battery of tests to assess their abilities. in the talking as if you are saying something
An electronic company is about to launch a new product.if the serial number for each piece produced has the following format:LLNNN where L stands for any letter in English and N is a number from 0 to 9,what is the name of the counting rules used t..
in a survey of families in which both parents work one of the questions asked was have you refused a job promotion or
the standard deviation of 112 units.. What is the probability that the demand for this item in the upcoming week will be between 600 and 700 units.
the tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean
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