How to find the percentiles for a data set - AP Statistics
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The 70th and 80th percentiles of a set of scores are 78 and 86, respectively; the interquartile range of the scores is 41. Which of these scores is more likely than the others to be at the 25th percentile?
The 70th and 80th percentiles of a set of scores are 78 and 86, respectively; the interquartile range of the scores is 41. Which of these scores is more likely than the others to be at the 25th percentile?
The interquartile range of a set of scores is the difference between the third and first quartile - that is, the difference between the 75th and 25th percentiles. The 75th percentile is between 78 and 86, so, if 41 is subtracted from those numbers, the upper and lower bounds of the 25th percentile can be found.
Of our choices, only 40 falls in this range.
The interquartile range of a set of scores is the difference between the third and first quartile - that is, the difference between the 75th and 25th percentiles. The 75th percentile is between 78 and 86, so, if 41 is subtracted from those numbers, the upper and lower bounds of the 25th percentile can be found.
Of our choices, only 40 falls in this range.
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Your class' scores on a recent quiz was listed on the board.
Calculate the 
percentile.
Your class' scores on a recent quiz was listed on the board.
Calculate the
To find the 
percentile, we find the product of 
and the number of items 
in the set.
We then round that number 
up if it is not a whole number, and the 
term in the set is the 
percentile.
For this problem, to find the 
percentile, we find that there are 20 items in the set. We find the product to be
Since 
in order to find the 
percentile we find the 
term in the set, which is
To find the
We then round that number
For this problem, to find the
Since
in order to find the
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Your gym class' shot put distances are listed in the set below.
Which score is the 
percentile?
Your gym class' shot put distances are listed in the set below.
Which score is the
To find the percentile, we find the product of and the number of items in the set.
We then round that number up if it is not a whole number, and the term in the set is the percentile.
For this problem, to find the 
percentile, we find that there are 
items in the set. We find the product to be
Since 
in order to find the 
percentile we find the 
term in the set, which is
To find the
We then round that number
For this problem, to find the
Since
in order to find the
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The following data set represents Mr. Marigold's students' scores on the final. If you got a 90 on the final, what percentile does that place you in?
The following data set represents Mr. Marigold's students' scores on the final. If you got a 90 on the final, what percentile does that place you in?
Your percentile is the percent of the data set that is at your score or below.
There are 26 students in this particular class.
Of those students, 23 students were at a 90 or below.
, or 
.
Your percentile is the percent of the data set that is at your score or below.
There are 26 students in this particular class.
Of those students, 23 students were at a 90 or below.
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The following data set represents Mr. Marigold's students' scores on the final. If you are in the 46th percentile, what did you score?
The following data set represents Mr. Marigold's students' scores on the final. If you are in the 46th percentile, what did you score?
If you scored in the 46th percentile, that means that 46% of your classmates scored the same as or worse than you.
This class has 26 students, and 46% of 26 is about 12.
Starting at 66 and counting 12 students forward would give you a 78.
This means that if you scored a 78, 12 students either had the same score or worse, so that is the 46th percentile.
If you scored in the 46th percentile, that means that 46% of your classmates scored the same as or worse than you.
This class has 26 students, and 46% of 26 is about 12.
Starting at 66 and counting 12 students forward would give you a 78.
This means that if you scored a 78, 12 students either had the same score or worse, so that is the 46th percentile.
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The following data set represents Mr. Marigold's students' scores on the final. If you are in the 96th percentile, what did you score?
The following data set represents Mr. Marigold's students' scores on the final. If you are in the 96th percentile, what did you score?
If you scored in the 96th percentile, that means that 96% of your classmates scored the same as or worse than you.
This class has 26 students, and 96% of 26 is about 25.
If 25 of your classmates did the same as or worse than you, that means only one person did better than you - nice work.
You must have gotten a 92, because it's the second-best score.
If you scored in the 96th percentile, that means that 96% of your classmates scored the same as or worse than you.
This class has 26 students, and 96% of 26 is about 25.
If 25 of your classmates did the same as or worse than you, that means only one person did better than you - nice work.
You must have gotten a 92, because it's the second-best score.
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The following data set represents Mr. Marigold's students' scores on the final. If you got a 74 on the final, what percentile does that place you in?
The following data set represents Mr. Marigold's students' scores on the final. If you got a 74 on the final, what percentile does that place you in?
If you scored a 74, you can count and discover that eight students did worse than or the same as you.
There are a total of 26 students in the class, so 8 students would be
or around 
.
This places you in the 31st percentile.
If you scored a 74, you can count and discover that eight students did worse than or the same as you.
There are a total of 26 students in the class, so 8 students would be
This places you in the 31st percentile.
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