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Answers
Mean height of plant is 30.5 cm.
Step-by-step explanation:
We are given the data about the heights (h in cm) of the plants below ;
Height of plants (h) Mid-point (X) Frequency (f)
0 < h < 10 5 1 5
10 < h < 20 15 4 60
20 < h < 30 25 7 175
30 < h < 40 35 2 70
40 < h < 50 45 3 135
50 < h < 60 55 3 165
Total 20 610
Here, mid-point is calculated by the following formula;
Mid-point for 0 < h < 10 =
=
Now, the mean for any frequency distribution is given by the following formula;
Mean, =
= = 30.5 cm
Hence, by using midpoints of each group, the mean height of a plant is 30.5 cm.