The mean of 30 values was 150. It was detected on rechecking that one value 165 was wrongly copied as 135 for the computation of the mean. Find the correct mean.
Choices.
A) 151
B) 149
C) 152
D) 148
E) None of the above
Corrected mean = 150×30−135+165/30   = 4500−135+165/30   =4530/30= 
<gadget id="calculator">4530/30</gadget>
<output>151</output>
151   151nswer 151
<result>A</result>
The mean of 30 values was 150. It was detected on rechecking that one value 165 was wrongly copied as 135 for the computation of the mean. Find the correct mean.