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On arranging the given data in ascending order of their magnitudes, we get :
➙ 7 , 9 , 11 , 13 , 15 , 17 , 19
Clearly, n = 7, which is an odd number.
★ Lower Quartile (Q¹)
★ Upper Quartile (Q³)
★ Inter-Quartile range
⇒ Q³- Q¹
⇒ 17 - 9
⇒ 8