17, Dec 2020
Compute the 40th percentile

Here are the grades on an exam for a class with 18 students:
15, 43, 51, 68, 71, 72, 75, 76, 80, 83, 84, 84, 86, 87, 89, 90, 93, 98
a) Compute the 40th percentile
b) Find the quartiles
c) Use the IQR to identify any outliers