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The lifetime of ZZZ batteries is normally distributed with a mean of 270 hours and a standard deviation of 10 hours. What number of hours would represent the 40th percentile in this distribution?
Use Hypothesis testing to compute te correlation between these two variables and these it for significance. Test at .01 level of significance.
In a sample of 32 DVD players, what is the probability the average life will be less than 8 years (96 months)? (please round your answer to 4 decimal places).
If 100 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?
q1 the gallop poll folks found that 27 of adults surveyed national survey said that they had been in a tornado.
Assume a factory manager wishes to buy machines to perform a certain task in a production process. Certain key parts are produced by these machines.
According to Chebyshev's Theorem, how many students scored between 24 and 78? Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 24 and 78?
Their mean monthly sales were $10,000 with a standard deviation of $1000. Construct a 95% confidence interval for the population mean.
How can you tell what are the solutions of a quadratic equation by looking at its graph? Explain.
Jolly Blue Giant Health Insurance is concerned about rising lab test costs and would like to know. Determine the essential sample size?
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days.
1.some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled through weed
A person claims to have ESP (extrasensory perception). A coin is tossed 16 times, and each time the person is asked to predict in advance whether the coin will land heads or tails.
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