Question

mean of 10 items is 15 on verification it was found 21 was miscopied and it is 12 find correct mean​

Answer 1

Answer:

14.1

Step-by-step explanation:

Mean of 10 items is 15

Thus sum  = 10 * 15 = 150

21 was miscopied and it would be 12

Thus, Correct sum would be 150 + 12 - 21 = 141

Hence Correct mean would be 141/10 = 14.1

Answer 2

Answer:

sum of X(incorrect)/total items = mean

sum of X(incorrect)/10 = 15

sum of X (incorrect) = 10*15=150

sum of X(correct) = sum of X(incorrect) - incorrect value + correct value

sum of X(correct) = 150-21+12 = 141

correct mean = sum of X (correct)/total items

correct mean = 141/10 = 14.1