In a language spelling test of 50 marks, the frequency distribution of marks secured by 30 students is given
below. Find the mean deviation of the frequency distribution.
Marks 12 - 16 17 - 21 22 - 26 27 - 31 32 - 36
No. of students 2 3 14 8 3
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Answer:
Represent the data given above by a grouped frequency distribution table, taking class intervals as 160 – 165, 165 – 170 etc.
(ii) What can you conclude about their heights form the table?
Solution:
(i) Here, the lowest value of the observation = 150
The highest value of the observation = 173
∴ Class intervals are 150 – 155, 155 -160, …, 170 – 175.
The required frequency distribution table is
NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.2 Q4.1
(ii) From the above table, we can conclude that more than 50% of the students are shorter than 165 cm.
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