Question: The serving speed (miles per hour) of some of the tennis players who participated in a tennis tournament are 125, 125, 127, 130, 132, 129, 130, 133, 135, 135 and 138. Which of the stem and leaf plots represents the data correctly?

A ) Plot 3
B ) Plot 4
C ) Plot 2
D ) Plot 1

Steps to derive

9 As all the numbers are three digit numbers, the digits in the tens and hundreds place will be the leaf and the ones' digit will be the stem.

10 The stems of the data values are 12 and 13 and the leaves are 5, 5, 7, 0, 2, 9, 0, 3, 5, 5 and 8.
 [All data values are greater than 120 and less than 140.]

11 List the unique stems and the corresponding leaves of each stem in the increasing order.

12 So, Plot 2 is the stem and leaf plot representing the data correctly.



Hence the right answer is Option C

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