Chapter Exam

Chapter-8 Statistics — Online MCQ Test

Q: What is the arithmetic mean of the numbers 2, 4, 6, and 8?

Answer: B. 5 — Arithmetic mean = sum of observations ÷ number of observations = 20 ÷ 4 = 5.

Q: The middle value of an arranged data set is called the ______.

Answer: B. Median — Median is the central value when the data are arranged in ascending or descending order.

Q: Find the median of the data: 3, 5, 7, 9, 11.

Answer: B. 7 — The data are already in order and there are 5 values, so the middle value is 7.

Q: The ages of 5 children are 8, 10, 12, 10, and 15. What is the median age?

Answer: B. 10 — Arranging the data gives 8, 10, 10, 12, 15, and the middle value is 10.

MATHS · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-8 Statistics with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th MATHS. This chapter covers: Description Covers collection organization analysis and graphical representation of data using statistical measures Keywords Mean Median Mode Graphs Data Statistics. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-8 Statistics — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th MATHS — Chapter-8 Statistics, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the arithmetic mean of the numbers 2, 4, 6, and 8?

A. 4
B. 5 ✓
C. 6
D. 7

Answer: B. 5
Arithmetic mean = sum of observations ÷ number of observations = 20 ÷ 4 = 5.

The middle value of an arranged data set is called the ______.

A. Mean
B. Median ✓
C. Mode
D. Range

Answer: B. Median
Median is the central value when the data are arranged in ascending or descending order.

Find the median of the data: 3, 5, 7, 9, 11.

A. 5
B. 7 ✓
C. 9
D. 11

Answer: B. 7
The data are already in order and there are 5 values, so the middle value is 7.

The ages of 5 children are 8, 10, 12, 10, and 15. What is the median age?

A. 8
B. 10 ✓
C. 12
D. 15

Answer: B. 10
Arranging the data gives 8, 10, 10, 12, 15, and the middle value is 10.

In a histogram, if the class intervals are unequal, which statement is TRUE in standard school-level interpretation?

A. Bars must still be drawn with equal widths
B. Frequency density should be used instead of frequency alone ✓
C. The tallest bar always shows the mean
D. The horizontal axis should be omitted

Answer: B. Frequency density should be used instead of frequency alone
For unequal class intervals, frequency density is used so that the area of each rectangle represents frequency correctly.

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