Question

In an attempt to be environmentally friendly, the city council decides that there must be at least 18 trees on each block in the city. A sample of 20 blocks was randomly surveyed, with these results (number of trees per block): 24, 17, 7, 20, 28, 27, 10, 21, 30, 8, 30, 27, 22, 27, 27, 13, 27, 20, 24, 17. What is the sample mean number of trees per block ()?
17.7



21.3



24



There is insufficient data to answer this question.

Answer 1

The mean is just the average of all numbers so:

24+17+7+20+28+27+10+21+30+8+30+27+22+27+27+13+27+20+24+17

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20

which is 426/20 = 21.3