Question

Find the mean of the data set given by the stem-and-leaf plot.


Test scores of a student \begin{tabular}{r|lll} \hline \multicolumn{1}{c|}{ Stem } & \multicolumn{2}{|c}{ Leaf } \\ \hline 6 & 1 & 4 & 8 \\ 7 & 4 & & \\ 8 & 3 & 6 & 9 \\ & & \multicolumn{2}{|c}{ Key \( 6 \mid 1=61 \)} \\ \cline { 2 - 3 } & \end{tabular}

• A. 77
• B. 74
• C. 75
• D. 68

Answer 1

The correct option is C 75

The given stem-and-leaf plot is

The data set is

61, 64, 68, 74, 83, 86, 89

Mean = $\frac{sumofalldata}{numberofdata}$

= $\frac{61+64+68+74+83+86+89}{7}$

= $\frac{525}{7}$

= 75

Hence, the mean of the data = 75.