The average marks in statistics of 10 students of a class were 75.anew student took admission with 80 marks whereas two existing students left the college. If the marks of these students were 50 and 49 find the correct mean
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Average = Sum of the numbers / Number of numbers
68 = \frac{a + b + c + d + e + f + g + h + i + j}{10}
10
a+b+c+d+e+f+g+h+i+j
680 = a + b + c + d + e + f + g + h + i + j
As a new student took admission,
a + b + c + d + e + f + g + h + i + j + 72
680 + 72 = 752
As the marks of the students who left were 40 and 39, we have to subtract them from 752.
752 - ( 40 + 39 )
= 752 - 79
= 673..
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