Question

If assumed mean (A) = 57.5 Σf_id_i = –10 and Σf_i = 80 then Mean = ______.

Options

• 57.625

• 57.125

• 57.375

• 57.275

Answer 1

If assumed mean (A) = 57.5 Σf_id_i = –10 and Σf_i = 80 then Mean = 57.375.

Explanation:

Using the assumed-mean formula `barX = A + (Σf_i d_i)/(Σ f_i)`.

Compute: `(Σ f_i d_i) / (Σ f_i) = -10/80`

= – 0.125

So, mean = 57.5 + (– 0.125) 

= 57.375