Below are 36 sorted ages of an acting award winner Find Uppe

Below are 36 sorted ages of an acting award winner. Find Upper P25 using the method presented in the textbook 18 25 26 32 35 36 36 37 37 38 40 43 46 47 48 49 50 55 57 57 57 61 62 65 65 66 67 68 71 73 75 76 77 79 79 80.

Solution

the percentile 25 will be

0.25 * 36 = 9 Rounding up to the nearest whole number, you get 9

so we know look the 9th position and 10th postion and we find the average of those values

in this case will be

average = 37+38 / 2 = 37.5

The 20th percentile then comes to (37 + 38) ÷ 2 = 37.5.