No need to convert discontinuous classes into continuous for class mark because class mark of C.I are same and gives same result \(\overline x\)
![](https://www.sarthaks.com/?qa=blob&qa_blobid=4662170398364531347)
∴ Assumed mean, a = 300.5
and di = (xi - a)
![](https://www.sarthaks.com/?qa=blob&qa_blobid=6065716443827554954)
= 300.5 + 2800/50
= 356.5
Hence, the average daily income of employees is Rs.356.5