91Ó°ÊÓ

The number of television sets repaired in a workshop by a technician in six one-month periods is as shown below. Present these data as a pictogram. $$ \begin{array}{lc} \text { Month } & \text { Number repaired } \\ \hline \text { January } & 11 \\ \text { February } & 6 \\ \text { March } & 15 \\ \text { April } & 9 \\ \text { May } & 13 \\ \text { June } & 8 \end{array} $$

The masses of 50 ingots in kilograms are measured correct to the nearest \(0.1 \mathrm{~kg}\) and the results are as shown below. Produce a frequency distribution having about seven classes for these data and then present the grouped data as (a) a frequency polygon and (b) a histogram. $$ \begin{array}{llllllllll} 8.0 & 8.6 & 8.2 & 7.5 & 8.0 & 9.1 & 8.5 & 7.6 & 8.2 & 7.8 \\ 8.3 & 7.1 & 8.1 & 8.3 & 8.7 & 7.8 & 8.7 & 8.5 & 8.4 & 8.5 \\ 7.7 & 8.4 & 7.9 & 8.8 & 7.2 & 8.1 & 7.8 & 8.2 & 7.7 & 7.5 \\ 8.1 & 7.4 & 8.8 & 8.0 & 8.4 & 8.5 & 8.1 & 7.3 & 9.0 & 8.6 \\ 7.4 & 8.2 & 8.4 & 7.7 & 8.3 & 8.2 & 7.9 & 8.5 & 7.9 & 8.0 \end{array} $$