(a) Compute inter-quartile range from the following data : তলৰ তথ্যৰ পৰা আন্তঃচতুর্থক পৰিসৰ গণনা কৰা : Class Interval : 0-10 10-20 20-30 30-40 40-50 শ্রেণী বিভাজন Frequency 2 17 20 15 6 বাৰবাৰতা
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C
34
Here N =15
N
+
1
n
=
16
4
=
4
which lies in 10-20
Upper quartile =
3
4
(
N
+
1
)
=
3
4
×
(
15
+
1
)
=
12
Q
1
=
4
t
h
term =20
Q
3
=
12
t
h
term =54
Inter Quartile range =
Q
3
−
Q
1
=
54
−
20
=
34
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