Cumulative Frequency and Quartiles

What is cumulative frequency?

• The difference between frequencies

• The average of frequencies

• A running total of frequencies

• A total of all frequencies

When plotting a cumulative frequency graph, which number should be plotted?

• The top number

• The midpoint

• The bottom number

• The average number

How do you find the median from a cumulative frequency graph?

• By finding the highest point on the graph

• By locating the middle value on the graph

• By calculating the average of all values

• By finding the lowest point on the graph

What is the median if the total frequency is 60?

• 30

• 60

• 15

• 45

What is the interquartile range?

• The range between the highest and lowest values

• The range between the upper and lower quartiles

• The average of all quartiles

• The sum of all quartiles

How do you calculate the lower quartile?

• By dividing the total frequency by 4

• By subtracting the upper quartile from the total

• By finding the median

• By adding all frequencies

What is the upper quartile if the total frequency is 70?

• 17.5

• 70

• 52.5

• 35

How can you estimate the number of people more than a certain time late?

• By adding all the frequencies

• By looking at the starting point of the graph

• By finding the difference between the total and the cumulative frequency at that time

• By calculating the average time

If 56 people have arrived by 42 minutes, how many more are expected?

• 14

• 28

• 42

• 56

How do you find the number of people more than 46 minutes late?

• By multiplying the cumulative frequency at 46 minutes by 2

• By adding the cumulative frequency at 46 minutes to the total

• By subtracting the cumulative frequency at 46 minutes from the total

• By dividing the cumulative frequency at 46 minutes by 2