Ex 3.1, 6 The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the: (i) Highest and the lowest marks obtained by the students
Arranging data in ascending order
39, 48, 56, 75, 76, 81, 85, 85, 90, 95
Highest marks = 95
Lowest marks = 39
Ex 3.1, 6 The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the: (ii) Range of the marks obtained
Range = Highest marks − Lowest marks
= 95 − 39
= 56
Ex 3.1, 6 The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the: (iii) Mean marks obtained by the group.
Max marks = (𝑇𝑜𝑡𝑎𝑙 𝑚𝑎𝑟𝑘𝑠)/(𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑠𝑡𝑢𝑑𝑒𝑛𝑡𝑠)
= (39 + 48 + 56 + 75 + 76 + 81 + 85 + 85 + 90 + 95)/10
= 730/10
= 73
Thus, mean marks in 73

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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