The lengths of turtles in a park are normally distributed with a mean of 23.2 inches and a standard deviation of 5.6 inches. What is the percentile rank of a turtle whose length is 15 inches?
4%
7%
27%
37%
[ 15 - 23.2 ] / 5.6 = z score = -1.46
The percentile associated with this z score is ≈ 7.2% = 7% (rounded)
+10 
