Question

For finding the mean by using the formula, `barx = A + h((sumf_iu_i)/(sumf_i))`, we have u_i = ?

Options

• `((A - x_i))/h`

• `((x_i - A))/h`

• `((A + x_i))/h`

• h(x_i – A)

Answer 1

`bb(((x_i - A))/h)`

Explanation:

In the step‑deviation method u_i is the class‑mark deviation from the assumed mean A scaled by the class width h, so `u_i = (x_i - A)/h`. Substituting this into `barx = A + h((Σf_iu_i)/(Σf_i))` gives the usual mean.