Question

If the mean of 3, 7, 11 and x is 9, what
is the value of x?
​

Answer 1

Answer:

X=15

Step-by-step explanation:

3+7+11+x / 4

21+x =36

X=15

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Answer 2

Answer:

mean = 9

3+2+11+x upon 9 =4

21 +x= 9×4

x= 36-21 = 15

x= 15 answer.