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Find the mean of the data:

Solution

space space straight N space equals sum f equals space 2 plus 8 plus 10 plus 7 plus 8 plus 5 equals 40

Let assumed mean, A be 70
∴

straight d space equals space straight x minus straight A space equals negative 50 comma space minus 20 comma negative 10 comma space 10 comma space 30 comma space 50

italic sum f d italic space italic equals space left parenthesis negative 100 right parenthesis plus left parenthesis negative 160 right parenthesis plus left parenthesis negative 100 right parenthesis plus 70 plus 240 plus 250 equals 560 minus 360 equals 200

∴

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