UPSKILL MATH PLUS

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Determine the mean of the following distribution:
 
Marks Number of students
\(\text{Below } 10\) \(5\)
\(\text{Below } 20\) \(9\)
\(\text{Below } 30\) \(17\)
\(\text{Below } 40\) \(29\)
\(\text{Below } 50\) \(45\)
\(\text{Below } 60\) \(60\)
\(\text{Below } 70\) \(70\)
\(\text{Below } 80\) \(78\)
\(\text{Below } 90\) \(83\)
\(\text{Below } 100\)
\(85\)
 
Answer:
 
The mean mark of the student is .
 
[Note: Enter the answer in to two decimal number.]