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To find the third quartile, first arrange the numbers in ascending order:
45.5, 46.9, 47.2, 47.5, 48.1, 49.7, 52.1, 53.3
The formula to find the third quartile is:
Q3 = (3/4) * (n+1) = (3/4) * (8+1) = (3/4) * 9 = 6.75
Since 6.75 falls between the 6th and 7th numbers in the ordered dataset, take the average of these two numbers to find the third quartile:
Q3 = (49.7 + 52.1) / 2 = 101.8 / 2 = 50.9
Therefore, the third quartile in this dataset is 50.9.