Chapter 12: Tales by Dots and Lines — Online MCQ Test
MATHS (KANITHA PRAKASH) · CLASS 8th · Karnataka State Board
Practice Chapter 12: Tales by Dots and Lines with a free chapter-wise online MCQ test.
This chapter covers: Line Graph Data Analysis Arithmetic Mean Average Trend Interpretation Coordinates Graphical Representation Data Collection Comparison Statistical Reasoning Visualization of numeric....
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Chapter 12: Tales by Dots and Lines — Important Questions & Answers
In a line graph, what does the horizontal axis usually represent?
- A. Data values
- B. Categories or time
- C. Only averages
- D. Only the highest value
Answer: B. Categories or time
The horizontal axis commonly shows time or categories in a line graph. The data values are usually shown on the vertical axis.
The horizontal axis commonly shows time or categories in a line graph. The data values are usually shown on the vertical axis.
Which of the following is the arithmetic mean of 6, 8, 10, and 12?
- A. 8
- B. 9
- C. 10
- D. 11
Answer: C. 10
The sum is 36 and there are 4 numbers. So, the mean is 36 ÷ 4 = 9.
The sum is 36 and there are 4 numbers. So, the mean is 36 ÷ 4 = 9.
The points on a line graph are joined by:
- A. Curved lines only
- B. Straight line segments
- C. Dots only, not joined
- D. Arrows
Answer: B. Straight line segments
In a line graph, data points are usually connected by straight line segments. This helps show the change between values.
In a line graph, data points are usually connected by straight line segments. This helps show the change between values.
The marks of a student in 5 subjects are 65, 70, 75, 80, and 90. Which statement is correct?
- A. The mean is 75
- B. The mean is 76
- C. The mean is 78
- D. The mean is 80
Answer: A. The mean is 75
The total is 380 and there are 5 subjects. So, the mean is 380 ÷ 5 = 76, not 75.
The total is 380 and there are 5 subjects. So, the mean is 380 ÷ 5 = 76, not 75.
If the points (2, 5), (4, 7), and (6, 9) are plotted on a line graph, what pattern do they show?
- A. Decrease by 2 each time
- B. Increase by 2 each time
- C. No change
- D. Random values
Answer: B. Increase by 2 each time
The y-values go 5, 7, 9, which increase by 2 each time. This shows a regular upward trend.
The y-values go 5, 7, 9, which increase by 2 each time. This shows a regular upward trend.