Question

If the mean of 3,7,11,and X is 9 what is the value of X

Answer 1

Answer:

I hope it is correct answer mark as brainlist answer

Answer 2

Answer:

15

Step-by-step explanation:

mean = 9

number of digits = 4

mean = addition of numbers/number of digits

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

9 = (21 + x)/4

36 = 21 + x

x = 36-21

x = 15