Question

Help I'm stuck! the average of 9 numbers is 12. If a 10th number is added the average becomes 11. What is the missing number?

Answer 1

Answer:

2

Step-by-step explanation:

Average of 9 numbers = 12

Sum of 9 numbers = 12 × 9

= 108

Let the 10th number be 'x'

Average of 10 numbers = 11

108 + x/10 = 11

x = 2.

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