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Example:
From the following data, compute the value of standard deviations and variance.

Suggested answer:


Standard deviation from assumed mean method:




Step 1:
If a = assumed mean, then take the deviations of the items from a and call it d.
Step 2:

Step 3:
Multiply each fd by the corresponding d to get fd2 and obtain S fd2.
Step 4:

Note :
This method involves very less calculation than the deviation from actual method.

