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anonymous

  • one year ago

The scores of eighth-grade students in a math test are normally distributed with a mean of 57.5 and a standard deviation of 6.5. From this data, we can conclude that 68% of the students received scores between and .

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  1. anonymous
    • one year ago
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    The standard deviation is a measure of how spread out numbers are. Its symbol is \[\sigma\] (the greek letter sigma) The formula is easy: it is the square root of the variance.

  2. anonymous
    • one year ago
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    Do you know what a variance is?

  3. anonymous
    • one year ago
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    no

  4. anonymous
    • one year ago
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    The variance is basically the average of the squared differences from the mean. To calculate the variance follow these steps: Work out the mean (the simple average of the numbers) Then for each number: subtract the mean and square the result (the squared difference). Then work out the average of those squared differences.

  5. anonymous
    • one year ago
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    btw, do u have any answer choices?

  6. anonymous
    • one year ago
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    ok thank you!

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