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KCPE revision questions and answers on the mean

Below is the number of tree seedling planted by each pupil on a tree planting day:
8 15 11 9 17 14 12 14 13 10 18 8 9 16 13 13 10 12
What was the mean number of seedlings planted by each pupil?
A. 12 $1/3$
B. 222
C. 12 $1/2$
D. 13

(4m 15s)

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