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StatisticsQ&A LibraryFill in the blank.The yearly rate of return on the Standard & Poor's 500 (an index of 500 large-cap corporations) is approximately normal. From January 1, 1960 through December 31, 2009, the S&P 500 had a mean yearly return of10.98 percent, with a standard deviation of about 17.46 percent. Take this normal distribution to be the distribution of yearly returns over a long period.The interval in which the middle 95 percent of all yearly returns lie is 10.98 ±(Give your answer to two decimal places.)Question

Asked Dec 4, 2019

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The critical value of *z* at 95% confidence level is 1.96.

The interval in which ...

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