# Video: Finding the Number of Observations in a Set of Data

The pictograph shows the number of books sold by a bookstore in a week. What is the total number of books sold that week?

01:16

### Video Transcript

The pictograph shows the number of books sold by a bookstore in a week. What is the total number of books sold that week?

To solve this problem, what we’re gonna do is actually work out the number of books sold each day first. And to do that, I’m going to add an extra column to our table. And I’ve labeled the column frequency because that’s gonna to be the number of books sold each day.

Okay, great! So let’s work it out. We can see that on Monday, four books were sold. On Tuesday, five books were sold. Wednesday, it was seven books. Thursday, it was five books. Friday, it was six books. And again Saturday, it was six books. Okay, great! So now what do we do?

Well the question asked us to work out the total number of books sold that week. So we’re actually going to add our values together. So we can say that the total books is equal to four plus five plus seven plus five plus six plus six, which is equal to 33. So therefore, we can say that the total books sold in the week is equal to 33.