Question

(vii) The quartile deviation of the following data 12, 10, 17, 18, 19, 21, 27, 30, 32, 38, 34 is
(A) 11
(B) 18
(C) 9
(D) 16
​

Answer 1

Answer:

First Quartile Q1 =

n

+

1

4

th term.

=

10

+

1

4

th term = 2.75th term

= 2nd term + 0.75 × (3rd term – 2nd term)

= 10 + 0.75 × (15 – 10)

= 10 + 3.75

= 13.75

Third Quartile Q3 =

3

(

n

+

1

)

4

th term.

=

3

(

10

+

1

)

4

th term = 8.25th term

= 8th term + 0.25 × (9th term – 8th term)

= 21 + 0.25 × (25 – 21)

= 21 + 1

= 22

Answer 2

Answer:

option c: 9 is the answer of the quartile deviation of the followling data