Finding the Average from a Grouped Frequency Table

The video tutorial covers a paper 1H from the summer 2018 series, focusing on solving questions using effective techniques. It begins with an introduction to the paper and the methods that help students achieve maximum marks. The tutorial then addresses Question 1, explaining how to determine the modal class by identifying the highest frequency. It continues with a detailed walkthrough of calculating the mean weight of parcels, including finding midpoints, multiplying by frequency, and dividing by total frequency to get the average. The tutorial emphasizes understanding the allocation of marks and practicing methods for exam success.

What is the primary focus of the introduction section?

• Providing answers to the questions

• Explaining the importance of techniques and methods

• Discussing the history of the paper

• Listing all the questions in the paper

How is the modal class determined from the table?

• By selecting the first class in the table

• By finding the class with the lowest frequency

• By identifying the class with the highest frequency

• By calculating the average of all classes

What is the first step in calculating the mean weight of parcels?

• Adding all the frequencies together

• Multiplying the frequency by the total weight

• Dividing the total weight by the number of classes

• Finding the midpoint for each class

Which of the following is NOT a step in calculating the mean weight?

• Adding the products of midpoints and frequencies

• Dividing the sum of products by total frequency

• Multiplying midpoints by frequencies

• Subtracting the smallest frequency from the largest

What is the correct mean weight of the parcels?

• 1.6 kilograms

• 1.8 kilograms

• 1.4 kilograms

• 1.2 kilograms

Which step is crucial for earning the third mark in the mean calculation?

• Having at least four correct products

• Finding the correct mean

• Dividing the total of products by total frequency

• Identifying the correct midpoints

What is the significance of finding the correct mean in the context of the paper?

• It is used to verify the modal class

• It helps in understanding the distribution of weights

• It is the only step needed for full marks

• It is irrelevant to the overall score