Question

average of 25 observations is 13. it was later found that an observation 73 was wrongly entered as 48. the new average shall be ?

Answer 1

Total observation = 25 x 13 = 325

Difference in observation = 73 - 48 = 25

so the observation was less by 25

new observation = 325 + 25 = 350

new average observation = 350/25 = 14