The mean of 40 observations was 100. It was found later that an observation 50 was wrongly taken as 75 The corrected new mean is  Choices
A) 125.8
B) 102.8
C) 99.375
D) 100.52
E) 122
Explanation:   Correct Sum = (100 * 40 + 50 - 75)= 
<gadget id="calculator">(100 * 40 + 50 - 75)</gadget>
<output>3_975</output>
3975.   99.375orrect mean= = 3975/40= 
<gadget id="calculator">3975/40</gadget>
<output>795/8 = around 99.375</output>
99.375   Answer: 99.375
<result>C</result>
The mean of 40 observations was 100. It was found later that an observation 50 was wrongly taken as 75 The corrected new mean is