The mean mark of 8 students is 65.If marks of 7 students are 60, 70, 55,50,60,65,85 then find the marks of 8th student.
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Marks of 8th Students = 75
Step-by-step explanation:
The mean mark of 8 students is 65
marks of 7 students are 60, 70, 55,50,60,65,85
Let say Marks of 8th Students = M
Total Marks = 60 + 70 + 55 + 50 + 60 + 65 + 85 + M
= 445 + M
Means Marks = Total Marks / Total Students
=> 65 = (445 + M)/8
=> 520 = 445 + M
=> M = 75
Marks of 8th Students = 75
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