The scores of twenty students in a test are as follows: 44, 47, 48, 49, 50, 51, 52, 53, 53, 54, 58, 59, 60, 61, 63, 65, 67, 70, 73, 75. Find the third quartile.

A.

62

B.

63

C.

64

D.

65

Correct answer is C

Third quartile Q3 = \(\frac{3}{4}\)Nth

Alternatively:
Split the score into equal quarters

44, 47, 48, 49, 50,        51, 52, 53, 53, 54,         58, 59, 60, 61, 63,     65, 67, 70, 73, 75.

Third quartile Q3 = [63 + 65] / 2 = 64