Question

what is the center of the data in the dot plot?
number of minutes to finish the quiz
dot plot with categories 10, 11, 12, 13, 14, 15 and corresponding dots
options: 12, 12.5, 13, 13.5

Explanation:

Step1: Count total data points

Count all dots: $4 + 4 + 8 + 7 + 3 + 7 = 33$

Step2: Find median position

Median is the $\frac{33+1}{2}=17^\text{th}$ value when ordered.

Step3: Order and locate 17th value

Cumulative counts: 10(4), 11(8), 12(16), 13(23). The 17th value falls in the 13 group.

Answer:

13