Question

the mean of 13 results is 20 . if the mean of first 7 results is 16 and that of the last 7 result is 25 . find the 7th result​

Answer 1

the mean of 13 results is 20 . if the mean of first 7 results is 16 and that of the last 7 result is 25 . find the 7th result​

Step-by-step explanation:

mean of 13 =20

sum =13*20=260

mean of first  7 is 16 ie.,

sum=7*16= 112.

sum of last 7=7*25=175

7th result= (sum of first 7 and last seven )- sum of 13

=(112+175)- 260

=287-260=27

7th result=27