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If a certain sample of data has a mean of 20.0

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If a certain sample of data has a mean of 20.0 [#permalink] New post 03 Feb 2011, 15:06
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Q1---------If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?
12.0, 13.5, 17.0, 23.5, 26.5

Q2---------For a certain examination, a score of 58 was 2 standard deviations below the mean, and a score of 98 was 3 standard deviations above the mean. What was the mean score for the examination?
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Re: I need help in mean, median, mode, and standard deviation [#permalink] New post 03 Feb 2011, 15:12
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sara933 wrote:
Q1---------If a certain sample of data has a mean of 20.0 and a standard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?
12.0, 13.5, 17.0, 23.5, 26.5

Q2---------For a certain examination, a score of 58 was 2 standard deviations below the mean, and a score of 98 was 3 standard deviations above the mean. What was the mean score for the examination?


Question #1: ps-questions-about-standard-deviation-85897.html (10th problem);
Question #2: ps-questions-about-standard-deviation-85897.html (3rd problem);

For more about Standard Deviation please check: Standard Deviation and ds-questions-about-standard-deviation-85896.html

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Re: I need help in mean, median, mode, and standard deviation   [#permalink] 03 Feb 2011, 15:12
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