Find the mean of the marks obtained by 30 students of Class IX of aschool, given in Example 2.10 20 36 92 95 40 50 56 60 7092 88 80 70 72 70 36 40 36 4092 40 50 50 56 60 70 60 60 88

Find the mean of the marks obtained by 30 students of Class IX of asch

1.	Find the mean of the marks obtained by 30 students of Class IX of aschool, given in Example 2.10 20 36 92 95 40 50 56 60 7092 88 80 70 72 70 36 40 36 4092 40 50 50 56 60 70 60 60 88
Answer» We know, `Mean = `Sum of all observations`/`Total number of observations Here, Sum of all observations ` = 10 + 20+ 36+ 92+ 95 +40` `+ 50+ 56+ 60+ 70+92+ 88+ 80 +70+ 72+ 70` `+36+ 40+ 36 +40+92+ 40+ 50+ 50+ 56+ 60+ 70 +60+ 60+ 88= 1779` Total number of observations `=30` So, `Mean = 1779/30 = 59.3`

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Find the mean of the marks obtained by 30 students of Class IX of aschool, given in Example 2.10 20 36 92 95 40 50 56 60 7092 88 80 70 72 70 36 40 36 4092 40 50 50 56 60 70 60 60 88

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