NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 2

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7. In the class intervals , , the number 20 is included in :

(A)

(B)

(C) Both the intervals

(D) None of these intervals

Answer: B

8. A grouped frequency table with class intervals of equal sizes using (270 not included in this interval) as one of the class interval is constructed for the following data: . The frequency of the class 310-330 is:

(A) 4

(B) 5

(C) 6

(D) 7

Answer: C

9. A grouped frequency distribution table with classes of equal sizes using (72 included) as one of the class is constructed for the following data:

. The number of classes in the distribution will be:

(A) 9

(B) 10

(C) 11

(D) 12

Answer: B

10. To draw a histogram to represent the following frequency distribution:

To Draw a Histogram to Represent the Following Frequency Distribution
To draw a histogram to represent the following frequency distribution

Class interval

Frequency

The adjusted frequency for the class is:

(A) 6

(B) 5

(C) 3

(D) 2

Answer: D

11. The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is:

(A) 28

(B) 30

(C) 35

(D) 38

Answer: D

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