Question: the mean of 30 values was 250 . it was detected on rechecking that one value 165 was wrongly copied as 135 for the computation of the mean . find the correct mean .
A) 151
B) 149
C) 152
D) 251
E) none of the above
Correct answer: D
Grade: 6 | Topic: Statistics and Probability | Difficulty: Medium | Standard: 6.SP.B.5.c