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2. From the data given below calculate the value of first and third quartiles, second and ninth deciles and forty-fifth and fifty-seventh percentiles. Height in centimeters Number of students Cumulative frequency 161-167 79 79 167-173 92 171 173-179 60 231 179-185 22 253 185-191 5 258 191-197 2 260 Total 260

2. From the data given below calculate the value of first and third quartiles, second and ninth deciles and forty-fifth and fifty-seventh percentiles.

Height in
centimeters Number of
students Cumulative
frequency
161-167 79 79
167-173 92 171
173-179 60 231
179-185 22 253
185-191 5 258
191-197 2 260
Total 260

Grade:

1 Answers

Latika Leekha
askIITians Faculty 165 Points
9 years ago
Hello student,
First of all, let us tabulate the data in a systematic form:
Class Interval f cf
161-167 79 79
167-173 92 171
173-179 60 231
179-185 22 253
185-191 5 258
191-197 2 260
Q1 = 161 + 6/79 .(65-0)
= 165.93
Q3 = 161 + 6/79 .(65-0)
= 165.93
D2 is given by 52nd value lying in C.I 161-167 and D9 lies in C.I. 179-185.
So, D2 = 161 + 6/79 .(52-0)
= 164.95
D9 = 179 + 6/22 .(234-231)
= 179.82
Similarly,
P45 = 167 + 6/92 .(117-79-0)
= 169.47
P57 = 167 + 6/92 .(148-79)
= 171.5

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