Worksheet Chapter 12: Data Handling

1. True or False: In a pie chart, the sum of all sector angles is equal to 180 degrees.

2. State an appropriate data collection method (Interview, Questionnaire, Observation, or Experiment) for each situation:
(a) Measuring the growth of plants given different fertilizer amounts.
(b) Determining customer satisfaction levels at a restaurant chain across 500 visitors.
(c) Counting the number of vehicles turning right at a busy intersection during rush hour.

3. A survey of 120 students recorded their favorite fruit: Apple (40), Banana (30), Mango (50). Calculate the sector angle for Mango in a pie chart.

4. The test scores of 10 students are: 52, 65, 71, 58, 83, 65, 77, 90, 65, 88.
(a) Construct a stem-and-leaf plot for the data.
(b) State the modal score.

5. The number of goals scored by a soccer team in 15 matches are: 0, 1, 2, 1, 3, 0, 2, 1, 1, 4, 2, 3, 1, 0, 2.
(a) Construct a frequency table for this data.
(b) Determine the mode and the percentage of matches in which the team scored at least 2 goals.

6. True or False: A stem-and-leaf plot retains all original individual data values while displaying the data distribution.

7. A pie chart shows student transport modes: Bus (140°), Car (100°), Bicycle (x°), Walking (40°).
(a) Calculate the value of x.
(b) If 18 students travel by bicycle, find the total number of students surveyed.

8. Fill in the blank: Data that can be measured on a continuous scale, such as height or weight, is known as ________ numerical data.

9. Which type of data representation is best suited to display changes in daily temperature over a week?

10. Classify each of the following data types as CATEGORICAL, DISCRETE NUMERICAL, or CONTINUOUS NUMERICAL:
(a) Number of storybooks read by a student in a month
(b) Blood group of blood donors
(c) Time taken by athletes to complete a marathon