Question

5. The average of 17 results is 60, if the average
of first 9 results is 57 and that of the last 9
results is 65, then what will bathe value of 9
result?​

Answer 1

Answer:

78

Step-by-step explanation:

Sum of first 9 results is

$9 \times 57 = 513$

Sum of last 9 results is

$9 \times 65 = 585$

Sum of all 17 is

$1020$

Ninth result is

(Sum of first 9 results +Sum of last 9 results) -Sum of all 17

$513 + 585 - 1020 = 78$