Question

mean of a grouped data calculated using direct method, assumed mean method or step deviation method: (A) Is the same (B) Varies slightly (C) has huge variation (D) none of these

Answer 1

Answer:

(A) Is the same

Step-by-step explanation:

Answer 2

Solution:

Whether, you calculate mean by

1. Direct method $=\frac{\text{Sum of all the observation}}{\text{total number of observation}}$

2. Assumed mean method , a= Assumed mean

$=a +\frac{sum (FX)}{Sum X}$

3. Step deviation method ,more or less same as  assumed mean method., and you choose a number which makes your calculation easier.

So,least time taking is step deviation method.

But in all cases mean are same.

Option A: is the same mean.