Question

Sam’s Music Store wanted to take a survey of the age range of people that visited the store. Over the course of a week, they ask 40 people their age as they walked in. Above is a box plot of the collected data. Answer the following questions about the box plot in relation to the problem.
How many customers were age 28 or below? Use a specific number, not a percentage.

Answer 1

Given:
40 people

box plot data:
minimum age : 20
Q1: 28
Median: 34
Q3: 42
maximum age: 48

Q1 represents 25% of the data set. 

40 x 25% = 10 

There are 10 people who are aged 28 and below. 

1st quartile is equal to 25% of the data set, the median is equal to 50% of the data set, 3rd quartile is equal to 75% of the data set.