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7. Frequency Distribution Tables and Graphs
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Q12 of 33 Page 156

Find the median of the data; 3.3, 3.5, 3.1, 3.7, 3.2, 3.8

For finding median, first we arrange data either in ascending or descending order,

3.1, 3.2, 3.3, 3.5, 3.7, 3.8


No of terms (n) = 6


As, n is even


Median is arithmetic mean of term and term.


⇒ Median is arithmetic mean of 3rd and 4th term.


⇒ Median


⇒ Median = 3.5


More from this chapter

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10

Arithmetic mean of marks (out of 25) scored by 10 students was 15. One of the student, named Karishma enquired the other 9 students and find the deviations from her marks are noted as − 8, − 6, − 3, − 1, 0, 2, 3, 4, 6. Find Karishma’s marks.

11

The sum of deviations of ‘n’ observations from 25 is 25 and sum of deviations of the same ‘n’ observations from 35 is − 25. Find the mean of the observations.

13

The median of the following observations, arranged in ascending order is 15.

10, 12, 14, x − 3, x, x + 2, 25. Then find x.

14

Find the mode of 10, 12, 11, 10, 15, 20, 19, 21, 11, 9, 10.

Questions · 33
7. Frequency Distribution Tables and Graphs
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 1 2 3 4 5
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