Arithmetic Mcqs


Q.  The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.

a. 57.4
b. 57.5
c. 58.9
d. 59.1


ANSWER: See Answer
 
Correct mean = 30x 58.5 -57 +75/30

= 1755+18/30 = 1773/30 = 59.1
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