Is Matter Around Us Pure Class 9 One-Shot Mazedar Full Chapter Lecture | Class 9 Science | 2021-22

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If there are two sections of class SSC in Mother 's Coaching , section A says if some of students of section B will join us then ratio of students of class A to that of class B becomes 4:9 , but if some of our classmates goes to section B then according to govt .rule one school can take max 200 students in one class (in cluding all sections) then total number of studets in class SSC.

Shyamala is a BA passed in first class with 63% marks. She had passed HSC examination in first class with 69% marks. She has also completed a certificate course in Computer Science with 'A: grade. Her date of birth is 23.9.1984.

Construct a frequency table for the following ages (in years) of 30 students using equal class intervals, one of them being 9-12 , where 12 is not included. 18, 12, 7, 6, 11, 15, 21, 9, 8, 13, 15, 17, 22, 19, 14, 21, 23, 8, 12, 17, 15, 6, 18, 23, 22, 16, 9, 21, 11, 16 .

A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.0 3.7 3.2 2.2 4.1 3.5 4.5 3.5 2.3 3.2 3.4 3.8 3.2 4.6 3.7 2.5 4.4 3.4 3.3 2.9 3.0 4.3 2.8 3.5 3.2 3.9 3.2 3.2 3.1 3.7 3.4 4.6 3.8 3.2 2.6 3.5 4.2 2.9 3.6 Construct a grouped frequency distribution table for this data, using class intervals of size 0.5 starting from the interval 2 - 2.5.

The average age of 30 students of a class is 14 years 4 months. After admission of 5 new student in the class the average becomes 13 years 9 months. The youngest one of the five new students is 9 years 11 months old. The average age of the remaining 4 new students is :