Question

The mean value of 3,7,11 and x is 9 . what is the value of x ​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

15

Step-by-step explanation:

Mean = Sum of all observations / No. of observations

9 = (3 + 7 + 11 + x) / 4

x = 36-21

x = 15