Main content

### Course: Digital SAT Math > Unit 7

Lesson 8: Probability and relative frequency: medium# Table data — Basic example

Watch Sal work through a basic Table data problem.

## Want to join the conversation?

- Why are there comments talking about rap fans? This question is about ice cream.(28 votes)
- Some of the older Khan Academy videos have been replaced by newer ones that are higher quality and more accurately reflect what the SAT is like presently. Comments are kept the same, though. You might find this in a couple cases especially in math, where the comment section is talking about a different problem.(42 votes)

- Why do you take the number of male rap fans out of the male total and not the entire total?(22 votes)
- I have the same question too, but I think it is because the question stated separated by gender. I could be wrong, yet I think that is the reason why.(7 votes)

- why didn't you say 4/10? i thought of it as what's the chance that a male would like rap music out of all the people that like rap music, and not out of all the males, who likes rap music?

the question was worded weirdly.(4 votes)- The question for your answer would be like: "What is the probability that people who like rap music are males?"(8 votes)

- yes we talking about ice cream like fr(5 votes)
- it stinks that you can't ask questions on the practice questions themselves so I am forced to ask my table data practice related question here:

In one of the table data practice problems there is a table showing gupta flie sample sizes in the years 2001 & 2002 for three different parks ( Lets call them B,F,G )

then it asks for the percentage likelyhood that a gupta fly was selected from parks B or F

But it does not specify the year. I finally just guessed maybe they meant in total, and went with that and I was obviously wrong but they did not ask for the year 2001 specifically so, how was I supposed to know? is there something in the problem I'm missing?(4 votes) - What should be the question for answer to be 4/72?(2 votes)
- A possible question could be:

If a person was randomly selected from the group, what is the probability that a male that likes rap music is selected?(3 votes)

- Why do you take the number of male rap fans out of the male total and not the entire total?

Answer Brooke Murphy-Petri's post “Why do you take the number”(3 votes) - Why was it 4/35 and not 4/72? The question never specified it should be taken just from the male survey sample.(2 votes)
- In the last sentence of the question, it asks for "the probability that a male likes rap music". From this, we gather that we want to find the fraction that tells us how many males like rap music out of the total amount of males. It's like if you're asking guys on the street whether they like rap music or not. You're never going to ask a girl because you're only asking guys, which is why the female part of the survey doesn't matter at all, and your total is 35 instead of 72. Does this make it clearer?(2 votes)

- When do you use the "total" total, the column total, and the row total? If this question ever came, I would've used the total total: 4/72(2 votes)
- You would not use the total of 72. The question asks about the probability that a MALE likes rap music. If you used the number 72, that would include the number of males AND females, which the question does not ask for. Therefore, you would use the total number of males, 35.(2 votes)

- is the math part of sat this easy bro? like this is a no brainer. i heard the majority are geometry and graphs(2 votes)

## Video transcript

- [Instructor] Angel's ice
cream shop sells ice cream by the scoop and by the pint. The table above shows the purchases made by his customers last weekend. Of the customers who bought scoops, what fraction also bought pints? So pause this video and see if you can figure
this out on your own. All right, now let's look at this. So "of the customers who bought scoops." So I can do that as the
denominator of a fraction. So customers, customers buying scoops. They are saying, "what
fraction also bought pints?" So bought, bought pints. So we're looking at the
customers that bought the scoops. So bought scoops is right over here. And we know that there's a
total of 310 that bought scoops. So this is going to be equal
to 310 as our denominator and then of them, which,
how many bought pints? Well, we could see that right
over here, 27 bought pints. So 27 over 310, which is
this choice right over here. And we're done.