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Chapter assessment
A. Choose the correct option.

1. The difference between the highest and the lowest observations in a data is
(a) frequency (b) tally mark (c) range (d) none of these
2. Some integers are marked on a board: 4, 5, 7, 10, 21, 8, 9, 11.
Find the range of the given data.
(a) 16 (b) 17 (c) 7 (d) 25
3. A coin is flipped 80 times and it lands on heads 32 times. What is the probability of getting heads?
(a) 0.4 (b) 0.6 (c) 0.5 (d) 0.8

4. If the mean of −2, 0, x, 3, and 7 is x, then x =
(a) 3 (b) 2 (c) −3 (d) −2
5. The median of the observations 2, 0, 4, 7, and 11 is
(a) 0 (b) 2 (c) 4 (d) 7
6. The mode of the observations 1, 1, 2, 4, 3, 2, 1, 2, 2, 4 is
(a) 1 (b) 2 (c) 3 (d) 4
7. Which measures of central tendency get affected if the extreme observations on both the ends of a
data arranged in descending order are removed?
(a) Mean and mode (b) Mean and Median
(c) Mode and Median (d) Mean, Median and Mode
8. Out of 5 brands of chocolates in a shop, a boy has to purchase the brand which is most liked by
children. What measure of central tendency would be the most appropriate if the data is provided
to him?
(a) Mean (b) Mode (c) Median (d) Range

B. Assertion and Reason Type Questions.
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct option as:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.

1. Assertion (A): The Range of the data 10, 15, 20, 19 and 25 is 10.
Reason (R): Range = Highest observation – lowest observation
2. Assertion (A): The middle most observation of a data series is called the median of the series.
Reason (R): Median divides the total frequency into 2 equal parts.

3. Assertion (A): The mode of the given set of numbers 1, 1, 2, 2, 2, 2, 3, 4, 4 is 2.
Reason (R): The mode of a set of observations is the observation that occurs most often.
4. Assertion (A): In a bar chart width of each rectangle is fixed.

Reason (R): Bar graph represents the data in the form of vertical bars.

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