Question

The mean of 10 numbers is 55. If one more number is included, their mean becomes 60. Find the included
number.​

Answer 1

Answer:

110 is the included answer.

Step-by-step explanation:

Mean = Sum of quantities/Number of quantities

Let the Sum of quantities be x,

55 = x/10

x = 55*10

Sum of quantities = 550

When 1 number is added,

The Number of Quantities become 10 + 1 = 11

Let the value of the number included be y,

550 + y/11 = 60

550 + y = 60*11

550 + y = 660

y = 660 - 550

y = 110

Hence, the value of the number included is 110.