GCSE Secondary Maths Age 13-17 - Probability & Statistics: Simple Charts and Graphs - Explained

The video tutorial explains how to interpret a composite bar chart showing sales data for computers, laptops, and tablets over three years. It covers calculating sales for specific items, identifying the greatest sales increase, and analyzing profit assumptions based on sales data. The tutorial emphasizes careful reading of the chart and understanding the axes and keys.

What does the vertical axis of the composite bar chart represent?

• The number of items sold

• The profit made

• The types of items

• The number of years

How many desktop computers were sold in 2015 according to the bar chart?

• 100

• 140

• 80

• 120

What does the shaded part of the bar chart represent?

• Laptops

• Desktop computers

• Tablets

• All items

What is the total number of laptops sold over the three years?

• 620

• 660

• 680

• 640

Which item had the greatest increase in sales over the three years?

• Tablets

• All had the same increase

• Desktop computers

• Laptops

What is a helpful tool for accurately reading values from a bar chart?

• A magnifying glass

• A protractor

• A calculator

• A ruler

Why can't we assume more tablets sold means more profit?

• Tablets are always cheaper

• The chart includes profit data

• The cost and sale prices are unknown

• The bar chart shows profit margins