Solution
First arrange the data in ascending order:
15 16 17 18 19 21 25 30 31 33 41
Q1 is the (4n+1)th term i.e
(411+1)=3rd term=17
Q2=median is the (2n+1)th term i.e
211+1=6th term=21Q3 is the 43(n+1)th term i.e
43(11+1)=9th term=31Imterquartile range:
Q3−Q1=31−17=14 ∴ the incorrect statement is that the value of Q2=19
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