Statistics Test

Question 1
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Five years ago, the average age of A and B was 15 years. Today, the average age of A, B and C is 20 years. How old will C be after 10 years?

A
35 years

B
40 years

C
30 years

D
50 years

Question 2
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The average age of a class of 30 students and a teacher decreases by 0.5 year, if we exclude the teacher. If the overall average is 14.5 years, then find the age of the teacher.

A
36.5 years

B
32.5 years

C
29.5 years

D
28.5 years

Question 3

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Match the following:

Column A	Column B
(i) A histogram is a graphical representation of a grouped frequency distribution with	(A) class mark
(ii) The middle value of a class interval is called	(B) continuous class
(iii) When the data is collected at the first time by an investigator, it is called	(C) raw data
(iv) When the data is compiled in the same form and order in which it is collected, it is known as	(D) primary data

(i) - A, (ii) - B, (iii) - C, (iv) - D

(i) - B, (ii) - A, (iii) - D, (iv) - C

(i) - A, (ii) - D, (iii) - C, (iv) - B

(i) - D, (ii) - C, (iii) - B, (iv) - A

Question 4

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Fill in the blanks with the help of the given table.

(i) The mean of a certain set of observations is 20. If each observation is divided by 2, then the new mean of the set of observations is P .
(ii) Q is that value of the given number of observations which divides it into exactly two parts.
(iii) The difference between the highest and lowest values in a given data is known as R of the data.
(iv) The points scored by John in 7 games of darts are 8, 10, 12, 13, 13, 13 and 5. The median of the given observations is S .