Question

Average of 15 numbers is 7.Out of them the average of first 8 numbers is 6.5 and the average of last egiht numbers is 9.5. The middle number is

Answer 1

Answer:

23

Step-by-step explanation:

sum of  elements= average * number of elements

sum of 15 elements =15 * 7=105

sum of first 8 elements   =8*6.5=52.0

sum of  last  8 elements    =8* 9.5=76.0

middle number= (sum of first 8 elements + sum of  last  8 elements )-sum of 15                             elements

                         =(52+76)-105

                          =128-105

                           =23