Marks obtained (in mathematics) by 9 student are given below: 60,67,52,76,50,51,74,45 and 56 (a) find the arithmetic mean (b) if marks of each student be increased by 4; what will be the new value of arithmetic mean.
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Solution
(a) Mean =∑x/n Here, n=9 Thus, Mean =(60+67+52+76+50+51+74+45+56)/9=531/9=59 (b) If the marks of each student be increased by 4 then new arithmetic mean will be =59+4=63