GCSE Secondary Maths Age 13-17 - Probability & Statistics: Frequency Tables - Finding Averages - Explained

The video tutorial explains how to determine the number of bags containing 19 buttons when given a total of 320 buttons distributed across bags with 19, 20, 21, and 22 buttons. The instructor calculates the total number of buttons in bags with 20, 21, and 22 buttons, then uses subtraction to find the remaining buttons in bags with 19 buttons. The solution involves dividing the remaining buttons by 19 to find the number of bags. The tutorial concludes with completing the table and understanding the marking scheme.

How many bags contain 20 buttons each?

• 5

• 3

• 7

• 1

What is the total number of buttons in the bags with 20, 21, and 22 buttons?

• 225

• 200

• 320

• 95

How many buttons are in the bags with 21 buttons each?

• 22

• 95

• 140

• 63

What is the number of bags that contain 19 buttons each?

• 7

• 1

• 5

• 3

How many marks are awarded for calculating the number of buttons in the 20, 21, and 22 button bags?

• Three

• Two

• None

• One