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 310330 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:
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