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Averages from Frequency Tables

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Question 21

A gardener recorded the height, h h\,h cm, of 20 sunflowers in a competition. The table shows information about his results.

Height (h h\,h cm)Frequency
100<h≤120100 < h \leq 120100<h≤1202
120<h≤130120 < h \leq 130120<h≤1305
130<h≤140130 < h \leq 140130<h≤1407
140<h≤150140 < h \leq 150140<h≤1504
150<h≤180150 < h \leq 180150<h≤1802

Calculate an estimate for the mean height of the sunflowers.

[3]

Averages from Frequency Tables Questions

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