A shopkeeper sold 30 articles and the selling price (in Rs) of these articles are as under:
11.30, 13.40, 28.75, 20.50, 17.80, 19.70, 10.50, 12.70, 27.65, 18.65, 16.45, 22.40, 11.40,
19.80, 14.60, 14.70, 22.80, 27.70, 16.75, 27.50, 11.50, 13.85, 23.40, 28.30, 15.75, 26.50,
10.70, 17.60, 24.35, 26.20.
Prepare a grouped frequency distribution, taking class intervals as 10-14, 14-18 etc. From
the table find out the number of articles whose price is less than Rs 22.
Answers
Given : A shopkeeper sold 30 articles and the selling price (in Rs) of these articles are
11.30, 13.40, 28.75, 20.50, 17.80, 19.70, 10.50, 12.70, 27.65, 18.65, 16.45, 22.40, 11.40, 19.80, 14.60, 14.70, 22.80, 27.70, 16.75, 27.50, 11.50, 13.85, 23.40, 28.30, 15.75, 26.50, 10.70, 17.60, 24.35, 26.20.
To Find : grouped frequency distribution, taking cla ss intervals as 10-14, 14-18 etc
Solution:
CI f
10 - 14 8 10.5 10.7 11.3 11.4 11.5 12.7 13.4 13.85
14 - 18 7 14.6 14.7 15.75 16.45 16.75 17.6 17.8
18 - 22 4 18.65 19.7 19.8 20.5
22 - 26 4 22.4 22.8 23.4 24.35
26 - 30 7 26.2 26.5 27.5 27.65 27.7 28.3 28.75
number of articles whose price is less than Rs 22
= 8 + 7 + 4
= 19
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