SOLUTION
Given the question in the question tab, the following are the solution steps to get the correct answer
Step 1: Define the word "less than or equal to"
less than or equal to means that values that are less than a number and also less equal to that number. It is denoted by ≤
Step 2: Write the given data

Step 3: Write the values less than or equal to 6 and their frequency

Step 4: Add the frequencies in step 3

Hence, the number of values less than or equal to 6 is 18
Option B