Exercise 8.4 - Chapter 8 Statistics 9th Maths Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated By SaraNextGen

On April 24, 2024, 11:35 AM

Ex 8.4
Multiple Choice Questions
Question 1.
Let $\mathrm{m}$ be the mid point and $\mathrm{b}$ be the upper limit of a class in a continuous frequency distribution. The lower limit of the class is
(1) $2 \mathrm{~m}-\mathrm{b}$
(2) $2 \mathrm{~m}+\mathrm{b}$
(3) $\mathrm{m}-\mathrm{b}$
(4) $m-2 b$
Solution:
(1) $2 m-b$
 

Question 2.
The mean of a set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78 . The value of discarded number is
(1) 101
(2) 100
(3) 99
(4) 98
Solution:

(3) 99

Question $3 .$
A particular observation which occurs maximum number of times in a given data is called its
(1) Frequency
(2) range
(3) mode
(4) Median
Solution:
(3) mode

Question $4 .$
For which set of numbers do the mean, median and mode all have the same values?
(1) $2,2,2,4$
(2) $1,3,3,3,5$
(3) $1,1,2,5,6$
(4) $1,1,2,1,5$

Solution:
(2) $1,3,3,3,5$
 

Question $5 .$
The algebraic sum of the deviations of a set of $n$ values from their mean is
(1) 0
(2) $n-1$
(3) $\mathrm{n}$
(4) $n+1$
Solution:
(1) 0

Question $6 .$
The mean of $a, b, c, d$ and $e$ is 28 . If the mean of $a, c$ and $e$ is 24 , then mean of $b$ and $d$ is
(1) 24
(2) 36
(3) 26
(4) 34

Solution:

(4) 34