Percentiles Practice

If I tell you that you scored at the 55th percentile on your final exam, you would know:

• 55% of the class scored the same or worse than you did

• You earned a 55% on the exam

• You failed the exam

• 45% of the class scored worse than you did

If your doctor tells you that your height puts you in the 70th percentile, you will know that you are taller than __________ percent of people your age.

• 30

• 70

• 100

• 40

A student recently took the SATs and their score correlated to the 60th percentile. This means that ______________ percent of all students score at or higher than the score the student received.

• 60

• 40

• 20

• 100

Connor does a survey on how much money 100 people spend over the Christmas period.

The results have been plotted on a cumulative frequency diagram (ogive).

Estimate the value of the 30th percentile.

• £ 24

• £ 20

• £ 30

• £ 28

A TV company surveyed 88 of its employees to find out how much time they spend travelling to work on a given day. The results of the survey are shown in the following cumulative frequency diagram (ogive).

Estimate the 50th Percentile

• 42 minutes

• 34 minutes

• 29 minutes

• 49 minutes

The Median is also referred to as

• the 25th Percentile

• the 50th Percentile

• the 75th Percentile

• the 100th Percentile

What is the PERCENTILE for the data value of 20 in the given data set.
Hint: What is the total number of numbers? How many of these numbers are less than 20? Then, find the percentile!

• 33rd

• 15th

• 27th

• 25th

What is the PERCENTILE for the data value of 30 in the given data set.

• 80th

• 75th

• 93rd

• 87th

How many houses visited represents the 75th percentile?

• 24

• 28

• 35

• 50

What is the median class of the scores?