00:01
Okay, in this question, we have a data set and we're supposed to find the percentile rank of some certain values.
00:06
So we are supposed to find the percentile rank of 6 .5 and the percentile rank of 7 .7.
00:24
So you need to realize that there are a lot of different definitions.
00:30
Yeah, there's a lot of different definitions and different uses, but i believe that what they're looking for here is just basically just a plain old percentile, which is just the percent of data that is below your value.
00:52
So if we want the percentile rank of 65, we need to find the number of values under 6 .5 divided by the total.
01:06
Okay, so if we order our data set from least to greatest, then it's easy to see how many values are less than 6 .5, and there are three values that are less than 6 .5.
01:18
And then you go ahead and divide by the total number of data points, which is 20, and that gets you 3 divided by 20, which is 0 .15.
01:33
And then multiply that by 100 to get the percentile, which is the 15th percentile.
01:41
If you're looking for a percentile rank for 7 .7, you take the number of values under 7 .7 so once again i'm looking at my ordered data set and i'm counting there's 1, 2, 3, 4, 5, 6, 7...