The mean of 20 values was 150. It was detected on rechecking that one value 160 was wrongly copied as 135 for the computation of the mean. Find the correct mean.  Choose the correct answer
A) 151
B) 149
C) 151.25
D) 148
E) none of the above

Rationale: corrected mean = 150 × 20 − 135 + 160 / 20 = 3000 − 135 + 160 / 20 = 3025 / 20 = 151.25 answer c
Answer: C