Find the arithmetic mean of the following data : [2 MARKS] (a) 2, 3,

Question

Find the arithmetic mean of the following data : [2 MARKS]
(a) 2, 3, 4, 5, 6, 7, 8, 9
(b) 12,13,14,15,16,17,18,19, 20

Answer:
:
Each part: 1 Mark
The arithmetic mean is,

Mean = \frac{Sum of all observations}{Total number of observations}

(a)

Mean = \frac{2 + 3 + 4 + 5 + 6 + 7 + 8 + 9}{8}

\Rightarrow Mean = \frac{44}{8} = 5.5

(b)

Mean = \frac{12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20}{8}

\Rightarrow Mean = \frac{144}{9} = 16

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