What is the standard deviation of exam scores
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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In a certain manufacturing process it is known that, on the average, 2 in 100 items are defective. What is the probability that 6 items will be inspected before a defective item is found.
From a lot of 10 missiles, 4 are selected at random and fired. If the lot contains 3 defective missiles that will not fire, what is the probability that What is the expected number of missiles that will fire?
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 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?
What is some statistical information around the likelihood of a successful hostage negotiation, given the information provided, and the length of time in which you have to do so.
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
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order autoregressive model.How many comparisons are lost in the development of the autoregressive model? How many parameters do you need to estimate? State th
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