Question

stem and leaf plots notes worksheet
exercise: science gets your heart beating!
here are the resting heart rates of 26 ninth-grade biology students. make a stemplot of these data. do not split stems.
61 78 77 81 48 75 70 77 70 76 86 55 65
60 63 79 62 71 72 74 74 64 66 71 66 68
4
5
6
7
8

Explanation:

Step1: Identify stems and leaves

Stems are the tens place digits, leaves are the ones place digits. Let's list data by stem:

• Stem 4: Data with tens digit 4 is 48. Leaf: 8
• Stem 5: Data with tens digit 5 is 55. Leaf: 5
• Stem 6: Data with tens digit 6: 61, 65, 60, 63, 62, 64, 66, 66, 68. Leaves: 0,1,2,3,4,5,6,6,8 (sorted)
• Stem 7: Data with tens digit 7: 78,77,75,70,77,70,76,79,71,72,74,74,71. Leaves: 0,0,1,1,2,4,4,5,6,7,7,8,9 (sorted)
• Stem 8: Data with tens digit 8: 81,86. Leaves: 1,6 (sorted)

Step2: Construct stem - leaf plot

Now, we build the plot by writing stems on the left and corresponding sorted leaves on the right.

Answer:

Stem	Leaf
5	5
6	0, 1, 2, 3, 4, 5, 6, 6, 8
7	0, 0, 1, 1, 2, 4, 4, 5, 6, 7, 7, 8, 9
8	1, 6