The mean of 80 observations was calculated as 55. It was found later on that one of the observations was misread as 64 instead of 46. The correct mean is Choose the correct choice from the following answers:
A) 39
B) 54.7
C) 60.3
D) 42.7
E) None of these
Explanation :   Correct sum = (55*80 + 46 - 64)= 
<gadget id="calculator">(55*80 + 46 - 64)</gadget>
<output>4_382</output>
4382.   Correct mean= 4382/80 = 54.7   Answer : 54.7
<result>B</result>
The mean of 80 observations was calculated as 55. It was found later on that one of the observations was misread as 64 instead of 46. The correct mean is