Answer: 57.4
Explanation:
First order the numbers from the smallest to the largest:
49.6, 55.1, 57.4, 49.7, 61.1, 43.4, 60.7, 50.1, 50.7, 58.8, 53.9, 43.2, 49.2, 47.9, 51.2
to:
43.2, 43.4, 47.9, 49.2, 49.6, 49.7, 50.1, 50.7, 51.2, 53.9, 55.1, 57.4, 58.8, 60.7, 61.1.
The position of third quartile is:
= (N + 1) * 3/4
= (15 + 1) * 3/4
= 12th position
That number is:
= 57.4