The following table shows the weights of children in a class.
Using this information:
a) Estimate the mean weight
b) Find the modal class
To estimate the mean weight, you know that \({7}\) children are between \({30~kg}\) and \({40~kg}\). As you do not know exactly how much they weigh, assume that they all weigh \({35~kg}\) (the midpoint of the group).
Find the mean for all the other groups:
a) Estimation of mean = \({1,215}\div{25} = {48.6}~{kg}\)
b) The modal class is the class that has the highest frequency. In this case the modal class is:
\[50 \leq m \textless 60\]