Chapter CSB, Problem 7.2E

To determine

Make Stem-and-leaf plot for data.

Answer to Problem 7.2E

  $\begin{array}{cccccc}Stem& Leaf& & & & \\ 1& 5& 8& & & \\ 2& 8& 9& & & \\ 3& 0& 0& 5& 5& 69\\ 4& 0& 3& 4& 5& 689\end{array}$

Explanation of Solution

Given information:

The class scores on a $50-item$ are shown in table,

  $\begin{array}{l}TestScores\\ \begin{array}{cccccc}45& 15& 30& 40& 28& 35\\ 39& 29& 38& 18& 43& 49\\ 46& 44& 48& 35& 36& 30\end{array}\end{array}$

Calculation:

Step.1 identify the least and greatest value number with place value and frequency from the table.

  $\begin{array}{l}placevalue=tens\\ leastvaluenumber=15\\ greatestvaluenumber=49\end{array}$

Step 2. Draw Stem-and-leaf plot lines.

  $\begin{array}{cccccc}Stem& Leaf& & & & \\ 1& & & & & \\ 2& & & & & \\ 3& & & & & \\ 4& & & & & \end{array}$

Step3. Arrange the data in leaf portion according to digit value from the table,

  $\begin{array}{cccccc}Stem& Leaf& & & & \\ 1& 5& 8& & & \\ 2& 8& 9& & & \\ 3& 0& 0& 5& 5& 69\\ 4& 0& 3& 4& 5& 689\end{array}$

Step 4.

  $key1|5=15and4|0=40$