Question

Mean of 12 numbers is 10. If one more number is added , the mean remains unaltered . find the numbers that is added

Answer 1

Please refer to above image for solution.

Answer 2

Answer:

As per Formula:

☆Sum of all observations / Number of all observations

☆ x/12=10

☆ x=12×10

☆ x=120

☆ 120+y/13=10

☆ 120+y=10×3

☆ 120+y=130

☆ Y=130-120

☆ Y=10

Hope this helps you!!!