3. Variance: To find the variance:
• subtract the mean,
, from each of the values in the data set, 
.
• square the result
• add all of these squares
• and divide by the number of values in the data set.
• subtract the mean,
, from each of the values in the data set, .• square the result
• add all of these squares
• and divide by the number of values in the data set.
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4. Standard Deviation: Standard deviation is the square root of the variance. The formulas are:
Mean absolute deviation, variance and standard deviation are ways to describe the difference between the mean and the values in the data set without worrying about the signs of these differences.
These values are usually computed using a calculator. |
Now I understand how to find variance and standard deviation, thank you!
BalasPadam