11. Find the first and third quartile for the set of data below.
14, 17, 21, 23, 17, 16, 15, 18, 14, 20, 19
Q₁ = 15, Q3 = 19
Q₁ = 15, Q3 = 20
Q₁ = 17, Q3 = 20
Q_1 = 15, Q3 = 17