Find the mean marks obtained by 15 students of a class 9 in
a school
43,42,40,41 ,39,28,29,41,26,28,29,42,44,31,38
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now if it is means then the formula is sum of total observation / total observation
therefore 43 + 42+40+41+39+28+41+26+28+29+42+44+31+38/15
= 512 /15
= 34.1333
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