STATISTICS (CDS)

Total Questions: 63

61. Consider the following in respect of variate which takes values 2, 2, 2, 2, 7, 7, 7 and 7.

I. The median is equal to mean.
II. The mode is both 2 and 7.

Which of the above statement(s) is/are correct?

Correct Answer: (c) Both I and II
Solution:

62. Consider the following statements pertaining to a frequency polygon of a frequency distribution of a continuous variable having seven class intervals of equal width.

I. The original frequency distribution can be reconstructed from the frequency polygon.
II. The frequency polygon touches the X-axis in its extreme right and extreme left.

Which of the above statement(s) is/are correct?

Correct Answer: (a) Only I
Solution:

Frequency polygon is formed by joining the mid-points of histogram. Original frequency distribution can be reconstructed from frequency polygon. Frequency polygon does not touch the X-axis in its extreme right and extreme left.

63. The mean of the following: distribution is 18.

Correct Answer: (a) 8
Solution: