NCERT Mathematics Class 9 Exemplar Ch 14 Statistics and Probability Part 1

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Exercise 14.1

1. The class mark of the class is:

(A)

(B)

(C)

(D)

Answer: B

2. The range of the data:

is

(A)

(B)

(C)

(D)

Answer: D

3. In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The lower limit of the class is:

(A) 6

(B) 7

(C) 8

(D) 12

Answer: B

4. The width of each of five continuous classes in a frequency distribution is 5 and the lower class-limit of the lowest class is 10. The upper class-limit of the highest class is:

(A) 15

(B) 25

(C) 35

(D) 40

Answer: C

5. Let m be the mid-point and l be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is:

(A)

(B)

(C)

(D)

Answer: B

6. The class marks of a frequency distribution are given as follows: The class corresponding to the class mark 20 is:

(A)

(B)

(C)

(D)

Answer: B