Examples

Chapter 3 Class 7 Data Handling
Serial order wise

### Transcript

Example 3 The ages in years of 10 teachers of a school are: 32, 41, 28, 54, 35, 26, 23, 33, 38, 40 (i) What is the age of the oldest teacher and that of the youngest teacher? Arranging data in ascending order Age of oldest teacher = 54 Age of youngest teacher = 23 Example 3 The ages in years of 10 teachers of a school are: 32, 41, 28, 54, 35, 26, 23, 33, 38, 40 (ii) What is the range of the ages of the teachers? Range = Age of oldest teacher − Age of youngest teacher = 54 − 23 = 31 Example 3 The ages in years of 10 teachers of a school are: 32, 41, 28, 54, 35, 26, 23, 33, 38, 40 (iii) What is the mean age of these teachers? Mean age = (𝑆𝑢𝑚 𝑜𝑓 𝑎𝑙𝑙 𝑎𝑔𝑒𝑠)/(𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑡𝑒𝑎𝑐ℎ𝑒𝑟) = (23 + 26 + 28 + 32 + 33 + 35 + 38 + 40 + 41 + 54)/10 = 350/10 = 35

#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.