Class 9 Mathematics — Chapter 12: Statistics
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 9 Mathematics, Chapter 12 (Statistics). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Data collected directly by the investigator is called:
Primary data is collected directly by the researcher through surveys, experiments, etc.
Find the median of: 18, 12, 6, 21, 15, 9, 3.
Arranged: 3,6,9,12,15,18,21. n=7, median=(7+1)/2=4th value=12.
Find the mean of first 10 multiples of 7.
First 10 multiples: 7,14,...,70. Mean=(7×(1+2+...+10))/10=7×55/10=38.5.
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