Percent level of confidence
A population is estimated to have a standard deviation of 16. We want to estimate the population mean within 3, with a 90 percent level of confidence. How large a sample is required? (Round up your answer to the next whole number.)
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what is the magnitude of the net electric field at the origin produced by this distribution of charge?
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Suppose thw weekly amount spent on repairs at a certain computer is normally distributed with a mean of $300 and a standard deviation $20
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