Question

quiz scores
frequency (number of students)
points
which interval does the median test score fall within?

Explanation:

Step1: Calculate total number of students

$2 + 3+2 + 6+3 + 5=21$

Step2: Determine position of median

Since $n = 21$ (odd), the median is at the $\frac{n + 1}{2}=\frac{21+ 1}{2}=11$ - th position when data is arranged in ascending - order.

Step3: Find cumulative frequencies

For 40 - 49: cumulative frequency = 2; for 50 - 59: cumulative frequency = 2 + 3=5; for 60 - 69: cumulative frequency = 5+2 = 7; for 70 - 79: cumulative frequency = 7 + 6=13.
The 11 - th value falls within the 70 - 79 interval.

Answer:

70 - 79