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Example 11 - Chapter 14 Class 9 Statistics (Term 1)

Last updated at Aug. 25, 2021 by

Example 11 - Find mean of marks obtained by 30 students - Examples

Example 11 - Chapter 14 Class 9 Statistics - Part 2

Transcript

Example 11 (Method 1) Find the mean of the marks obtained by 30 students of Class IX of a school, given in Example 2. 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 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 Mean marks = 1779/30 = 59.3

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.