The daily income of a sample of 50 employees are tabulated as follows.

Find the mean daily income of employees.

No need to convert discontinuous classes into continuous for class mark because class mark of C.I are same and gives same result

∴ Assumed mean, a = 300.5

and d_i = (x_i - a)

= 300.5 + 2800/50

= 356.5

Hence, the average daily income of employees is Rs.356.5