Question

If 9is the mean of 5, 7, a, 8, 10, 11 Find 'a'​

Answer 1

Step-by-step explanation:

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Answer 2

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mean = sum of all observations÷total number of observations

therefore,

9 = (5+7+a+8+10+11)÷6

9 = (41+a)÷6

9×6= 41+a

54-41=a

a=13

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