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According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
选项：

A:68.26;
B:88.89;
C:99.74;
D:95.44

发布时间：2024-05-14 16:37:09

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1.According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.选项： A: 68.26; B: 88.89; C: 93.75; D:95.44
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3.Approximately ( ) of the data in a bell-shaped distribution lies within ± two standard deviations of the mean. 选项： A、68% B、95% C、97% D、99.99%
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5.According to Chebyshev's Theorem, at least what percent of the observations lie within plus and minus 1.75 standard deviations of the mean? 选项： A、56% B、95% C、67% D、100%
6.Which of the following statements about the arithmetic mean is not always correct? 选项： A、The mean is a measure of the middle (centre) of a distribution. B、Half of the observations are on either side of the mean. C、The sum of the deviations from the mean is zero. D、The value of the mean times the number of observations equals the sum of all of the observations.
7.中国大学MOOC: We wish to develop a confidence interval for the population mean. The population follows the normal distribution. We collect a random sample of 10 observations and the sample standard deviation is 3. We decide to use the 95 percent level of confidence. The margin of error for the confidence interval is:
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According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.选项： A:68.26; B:88.89; C:99.74; D:95.44

According to the empirical rule, if the data form a "bell-shaped" normal distribution, ________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
选项：

A:68.26;
B:88.89;
C:99.74;
D:95.44