Calculate the arithmetic mean, correct to one decimal place, for the following frequency distribution of marks obtained in a Geometry test. | Marks | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | | :--- | :---: | :---: | :---: | :---: | :---: | | No of students | 7 | 13 | 15 | 12 | 3 | Attempt any four questions from this Section
Explanation
To calculate the arithmetic mean, we need to first find the midpoint of each class interval and multiply it by the frequency of that interval. We can then add up these products and divide by the total frequency to find the mean. The midpoints of the class intervals are 5, 15, 25, 35, and 45. The frequencies are 7, 13, 15, 12, and 3. We can then calculate the products and add them up to find the mean.
⬆ Related Topic
📘 Syllabus
📝 Practice Questions
Practice Previous Year Questions →
🤖 Practice with AI
Generate Practice Question Paper →
📚 Related Concepts
- After an examination, a teacher wants to know the marks obtained by maximum number of the students in her class. She req
- (ii) An electric oven is designed to work on the mains voltage of 220 V . This oven consumes 11 units of electrical ener
- (ii) Two identical resistors of $24 \Omega$ each are connected to a battery of 6 V . Calculate the ratio of the power co
- Power of lens is -0.5 D . What is the relation between the power of a lens and its focal length ? Calculate the focal le
- An electric heater has a resistance of $690 \Omega$ and is designed to operate at 230 V . What are the characteristics o