Check sibling questions

Example 3 - Chapter 12 Class 9 Statistics

Last updated at May 29, 2023 by

Example 7 - A teacher wanted to analyze the performance - Examples

Example 7 - Chapter 14 Class 9 Statistics - Part 2
Example 7 - Chapter 14 Class 9 Statistics - Part 3

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Book a free demo

Transcript

Example 3 A teacher wanted to analyze the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows: 0 - 20, 20 - 30, . . ., 60 - 70, 70 - 100. Then she formed the following table: Make histogram of the data The data has class intervals of varying width. So, we calculate adjusted frequency Adjusted frequency = (𝐹𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 × 𝑅𝑒𝑞𝑢𝑖𝑟𝑒𝑑 𝑠𝑖𝑧𝑒 𝑜𝑓 𝑖𝑛𝑡𝑒𝑟𝑣𝑎𝑙)/(𝐶𝑢𝑟𝑟𝑒𝑛𝑡 𝑠𝑖𝑧𝑒 𝑜𝑓 𝑖𝑛𝑡𝑒𝑟𝑣𝑎𝑙)

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

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.