Question

the students in a class collected data on the number of minutes some of them spend brushing their teeth every day. that data is shown in the dot plot below.
brushing teeth
time brushing (minutes)
how many students brushed their teeth for less than 3.5 minutes?
answer
$square$ students

Explanation:

Step1: Count dots at 1.5 mins

There are 2 dots, so 2 students.

Step2: Count dots at 2 mins

There are 3 dots, so 3 students.

Step3: Count dots at 2.5 mins

There is 1 dot, so 1 student.

Step4: Sum all valid counts

$\text{Total} = 2 + 3 + 1$

Answer:

6 students