Question

the average of 7numbers 6,9,12,x,5,4,12is 9find the value of missing number?
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Answer 1

Step-by-step explanation:

The of all numbers = 58 + X

Average =

Sum of all observations/Total number of observations

9 = (58+X)/7

58+X=63

X=5

Answer 2

Answer:

x = 15

Step-by-step explanation:

avg of 7 nos. is 9

sum= 6+9+12+x+5+4+12

= 48 + x

avg = sum/total no. of nos.

avg =9= 48 + x/7

63 =48 + x

x = 15