Determin the standard deviation of exam scores
Suppose the scores for a college entrance exam follow a normal distribution with mean 520. You are told that 95% of the scores range between 400 and 640. Using the 68, 95,99.7 rule, what is the standard deviation of exam scores?
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The life span of a battery is normally distributed with a mean of 2200 hours and a t percent of batteries have a life standard deviation of 60 hours. What percent of batteries have a life span that is more than 2275 hours? Would it be unusual for
At the end of the experimental period, the weights of the trout were (in grams): 124, 125, 123, 120, 124, 127, 125, 126 and 121. Another special mixture, Fatso 1B, was used in another pond. The mean of the population was computed to be 126.9 grams
Suppose the scores for a college entrance exam follow a normal distribution with mean 480. You are told that 95% of the scores range between 300 and 660. Using the 68, 95,99.7 rule, what is the standard deviation of exam scores?
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If using the method of least squares for fitting trends in annual time series containing 25 consecutive yearly values. What coded value do you assign to X for the first year and fifth year in the series?What coded value do you assign to X for the
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Find a 90% confidence interval for the population mean if the sample mean is 1250 with a sample standard deviation of 35 for a sample of 20. Note sample size is less than 30 and the population standard deviation is unknown. Be sure to use a t-scor
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