the mean of 12 number is 50.when a new number is added the new average is 51.find the added number?

Asked by Kusum and Sanjeet | 12th Jun, 2015, 08:36: AM

Expert Answer:

begin mathsize 14px style M e a n space o f space 12 space n u m b e r s equals 50 T h u s comma space s u m space o f space 12 space n u m b e r s equals 50 cross times 12 equals 600 N e w space n u m b e r space i s space a d d e d. n o w comma space m e a n space o f space 13 space n u m b e r s equals 51 S u m space o f space 13 space n u m b e r s equals 51 cross times 13 equals 663 H e n c e comma space A d d e d space n u m b e r equals S u m space o f space 13 space n u m b e r s minus S u m space o f space 12 space n u m b e r s equals 663 minus 600 equals 63 end style

Answered by Rashmi Khot | 12th Jun, 2015, 08:59: AM