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muralidhar jena

· started a discussion

· 1 Months ago

murali (Question: 232960.0 )

231-215=16 less
16/40=0.4
72-0.4=71.6

Question:
The average marks of 40 students in a test is 72. Later it is found that three marks 63, 70 & 82 were wrongly entered as 73, 78 & 80. The average marks after mistakes were rectified is:
Options:
A) 72.4
B) 72.2
C) 71.6
D) 71.8
Solution:

Ans: (c)

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