Standard deviation and sample mean from table?
Obviously you can't get the exact numbers, because you only have ranges, but you can estimate by using the midpoint of each range. If you have a column with the midpoint of each range then:
=SUMPRODUCT(midpoint column, frequency column)/SUM(frequency column)
...would give you the mean.
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Can someone tell me how you would find the standard deviation of the numbers below in Excel? Everything I have tried is wrong. Thanks ahead of time.
Class. Frequency 11-28. 14 29-46. 12 47-64. 2 65-82. 6
Obviously you can't get the exact numbers, because you only have ranges, but you can estimate by using the midpoint of each range. If you have a column with the midpoint of each range then:
=SUMPRODUCT(midpoint column, frequency column)/SUM(frequency column)
...would give you the mean.
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