Class 9 Computer & AI Chapter 2: The Maths AI Needs — practice questions with answers
Free practice for Class 9 Computer & AI, Chapter 2: The Maths AI Needs. Try the solved questions below, then take a free test with instant marking and explanations.
45 questions16 easy, 21 medium, 8 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. How is the median of a dataset found?
- Sort the values and take the middle one
- Add all values and divide by the count
- Take the most frequent value
- Subtract the smallest from the largest
Show answer
Answer: A. Sort the values and take the middle one
Why: median = middle(sorted). [AI for New Learner — Senior 1, Ch 2]
Why: median = middle(sorted). [AI for New Learner — Senior 1, Ch 2]
Q2. Find the mean of [40, 55, 60, 70, 100].
Show answer
Answer: 65 (± 0)
Why: 325 ÷ 5 = 65. [AI for New Learner — Senior 1, Ch 2]
Why: 325 ÷ 5 = 65. [AI for New Learner — Senior 1, Ch 2]
Q3. Find the median of [40, 55, 60, 70, 100].
Show answer
Answer: 60 (± 0)
Why: The middle (3rd) value is 60. [AI for New Learner — Senior 1, Ch 2]
Why: The middle (3rd) value is 60. [AI for New Learner — Senior 1, Ch 2]
Q4. Reyansh’s club found canteen snack prices had median ₹25 but mean ₹38. What caused the gap?
- Two very expensive ₹200 sandwiches pulled the mean up
- A calculation mistake
- Too many cheap snacks
- The median is always smaller
Show answer
Answer: A. Two very expensive ₹200 sandwiches pulled the mean up
Why: A single number can lie about the data. [AI for New Learner — Senior 1, Ch 2]
Why: A single number can lie about the data. [AI for New Learner — Senior 1, Ch 2]
Q5. What does the standard deviation (stdev) measure?
- How spread out the values are around the mean
- The middle value
- The most common value
- The total of all values
Show answer
Answer: A. How spread out the values are around the mean
Why: Small stdev = bunched; large = spread out. [AI for New Learner — Senior 1, Ch 2]
Why: Small stdev = bunched; large = spread out. [AI for New Learner — Senior 1, Ch 2]
Q6. What is variance?
- The square of the standard deviation
- The square root of the mean
- The middle value
- The largest value minus the mean
Show answer
Answer: A. The square of the standard deviation
Why: Spread before taking the square root. [AI for New Learner — Senior 1, Ch 2]
Why: Spread before taking the square root. [AI for New Learner — Senior 1, Ch 2]
Practise all 45 questions free
Timed test, marked instantly, with the correct answer and explanation for every question and a chapter-wise report.
Start the free testFrequently asked questions
How many practice questions are there for Class 9 Computer & AI Chapter 2: The Maths AI Needs?
45 questions (16 easy, 21 medium, 8 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 9 Computer & AI syllabus, used by CBSE and many state boards.