Question

In the formula  `barx=a+h((sumf_iu_i)/(sumf_i))`, for finding the mean of grouped frequency distribution u_i = ______.

Options

• `(x_i+a)/h`

• h(x_i - a)

• `(x_i-a)/h`

• `(a-x_i)/h`

Answer 1

In the formula  `barx=a+h((sumf_iu_i)/(sumf_i))`, for finding the mean of grouped frequency distribution u_i = `(x_i-a)/h`.

Explanation:-

It is given that  `barX = A +h (1/Nsumf_iu_i)`.
This is the formula to find mean of any data by step deviation method.
Here,

`u_i=(x_i-a)/h`

Where x_i are the mid values, A is assumed mean and h is class size .