Question

if 9 is the mean of 5, 7, 8, , 10, 11, find a

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Answer 1

Mean = (5+7+8+a+10+11)/5

9 = (30+a)/5

9×5 = 30+a

45 = 30+a

=>a=45-30

=>a=15(ans)

Hope it helps.....plz mark me brainliest.....

Answer 2

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