Chapter-8 Statistics — Online MCQ Test
MATHS · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-8 Statistics with a free chapter-wise online MCQ test.
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.
Chapter-8 Statistics — Important Questions & Answers
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.
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.
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 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.
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.
For unequal class intervals, frequency density is used so that the area of each rectangle represents frequency correctly.