00:01
Here we are given the following information.
00:02
Here we are giving the mean of the three test scores is 79.
00:06
We then want to figure out here what must the score on a fourth test be to get the mean to 84.
00:14
Okay, so in order to do this, let's look at what's happening.
00:18
We know that we have three tests.
00:20
We'll say test one, plus two, plus three, those scores, divided by three must equal seven nine.
00:29
So what we want to do now is to say, well, we then need to go ahead and look at the problem we have.
00:42
We have one plus two, plus three, and then plus four, divide by four, must equal 84...