Question

The mean of 10 no. is 55. If one more no. is included ,their mean 60 . find the included no. ​

Answer 1

Step-by-step explanation:

the mean of 10 number is 55

=> the sum of 10 numbers = 55*10 => 550

when one number is included the mean becomes 60

i.e. the mean of 11 numbers is 60

=> the sum of 11 numbers =60*11 =>660

.

. . the included number = sum of 11 numbers -

sum of 10 numbers

=>660-550=110

Answer. 110