Find the mean marks of students for the following distribution:

Marks to. Number of students
0and about.             80
10 and about.           77
20and about.             72
30and about.              65
40and about.              55
50and about.              43
60and about.              28
70and about.                16
80and about.               10
90and about.               8 
100and about.            0
 

Why it is happejing like that
VISUALISING SOLID SHAPE LESSON
ANY ONE ANSERIS NOT COMING
IT  IS SHOWING BLANK PAGE!
Please help🙏🙏🙏🙏🙏🙏🙏

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