Determining the confidence interval for the population mean
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean µ.
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Today you have $5,120 to invest, and want to have $572,132 in 49 years. What rate of return must you earn in order to meet your target?
Assume that IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If a sample of 70 people are selected, find the probability that the mean IQ score of the sample is greater than 102.
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A motor bike battery manufacturer found that the life of their batteries is normally distributed with a mean life span of 8700 hours and a standard deviation of 400 hours. If a battery is selected randomly, find the probability that the battery wi
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean µ
A cold storage room has walls made of 0.23 m of brick on the outside, 0.08 m of plastic foam find the rate of heat removal by refrigeration if the total wall area is 90 m^2.
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You take a trip by air that involves three independent flights. If there is an 82 percent chance each specific leg of the trip is done on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.)
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