In the ___ method of calculating mean we divide the deviations by the same number to simplify calculations.
The method in question is the step-deviation method.
In the step division method of calculating mean, we divide the deviations by the ___ of class intervals to simplify calculations.
Calculate the standard deviation by :
(A) Actual mean method
(B) Direct method
(C) Short cut method.
3, 4, 6, 7, 10