Find the mean of the marks obtained by 30 students of class 9th of a school, given in example 2.
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Step-by-step explanation:
Find the mean of the marks obtained by 30 students of Class IX of a school, given in Example 2.
10
20
88
92
80
92
70
72
95
70
36
40
60
70
40
40
36
50
50
56
40
60
50
70
56
60
36
88
60
92
Mean(x): = Sum of observations Number of observations
Sum of observation = 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
Number of observations(n) = 30
1779 Mean = = 59.3 30
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