Finding the Modal Class and Completing a Cumulative Frequency Table

The video tutorial explains how to analyze a table of money spent by families on holidays. It covers identifying the model class, completing a cumulative frequency table, plotting a cumulative frequency graph, calculating the interquartile range, and estimating the number of families spending more than a specified amount. The tutorial emphasizes accuracy in plotting and calculations to ensure correct results.

What is the model class in a frequency table?

• The class with the average frequency

• The class with the lowest frequency

• The class with the median frequency

• The class with the highest frequency

How do you calculate the cumulative frequency?

• By adding each frequency to the previous cumulative total

• By multiplying each frequency by the class width

• By subtracting each frequency from the total

• By dividing each frequency by the total number of data points

What is the first step in plotting a cumulative frequency graph?

• Use the upper class boundary for plotting

• Use the lower class boundary for plotting

• Use the midpoint of each class for plotting

• Use the frequency of each class for plotting

When plotting a cumulative frequency graph, how should the points be connected?

• With straight lines

• With a dashed line

• With a smooth curve

• With a dotted line

What is the interquartile range?

• The difference between the maximum and minimum values

• The sum of the upper and lower quartiles

• The difference between the upper and lower quartiles

• The average of the upper and lower quartiles

How do you find the lower quartile on a cumulative frequency graph?

• By finding 1/4 of the cumulative frequency

• By finding 3/4 of the cumulative frequency

• By finding 1/2 of the cumulative frequency

• By finding the total cumulative frequency

How do you determine the number of families that spent more than a certain amount using a cumulative frequency graph?

• By dividing the cumulative frequency at that amount by the total frequency

• By adding the cumulative frequency at that amount to the total frequency

• By multiplying the cumulative frequency at that amount by the total frequency

• By finding the total frequency and subtracting the cumulative frequency at that amount

What is the cumulative frequency value for families spending up to £450?

• 90

• 108

• 120

• 100

If the total number of families is 120, how many spent more than £450?

• 8

• 10

• 12

• 15

What is the importance of accurately plotting the cumulative frequency graph?

• It ensures correct estimation of quartiles and other statistics

• It helps in calculating the mean

• It is necessary for calculating the standard deviation

• It is used to find the mode