Question

The average of 16 numbers is 48. The average of first 7 numbers is 45 and the average of next 6 numbers is 52 if the 14th number is 11 less than 15th number and is 5 more than the 16th number, then the average of 15th and 16th number is

Answer 1

Answer:

The mean of a number of observation is the sum of the values of all the ... Sum of the last 6 observations =(6×52)=312

Answer 2

Answer:

sum of 16 no. =16x48=768

sum of first 7 no. =7x45=315

sum of next 6 no. =6x52=312

remaining sum=768-(315+312)=141

i.e 14th+5th+16th=141

ATQ

let 14th no. =x

threfore 15th=x+11

and 16th =x-5

now, x+x+11+x-5=141

3x+6=141

x=45

hence 15th no=56 and 16th no=40

average=48