The weights of tea in 70 packets are shown in the following table

Find the mean weight of packets.

First, we find the class marks of the given data as follows.

Here, (assume mean)

and (class width)

By assumed mean method,

= 203.5 - (108/70)

= 203.5 - 1.54 = 201.96

Hence, the required mean weight is 201.96 g.

4