Question

find the median of the following list of grades:
billy = 60, sam = 90, sue = 90, trey = 80
a 30
b 80
c 85
d 90
rmmm-46

Explanation:

Step1: Order the grades

First, we list the grades in ascending order: \( 60, 80, 90, 90 \)

Step2: Find the median

Since there are 4 values (an even number), the median is the average of the two middle numbers. The two middle numbers are \( 80 \) and \( 90 \).
The formula for the average of two numbers \( a \) and \( b \) is \( \frac{a + b}{2} \).
Substituting \( a = 80 \) and \( b = 90 \), we get \( \frac{80 + 90}{2} = \frac{170}{2} = 85 \)

Answer:

C. 85