GCSE Secondary Maths Age 13-17 - Probability & Statistics: Tally Chart - Explained

The video tutorial explains how to interpret frequency charts and pictograms, focusing on identifying errors in data representation. It uses the example of CD sales over three days to illustrate common mistakes in tally charts and pictograms. The tutorial emphasizes the importance of understanding symbols and keys in pictograms and highlights the need for accuracy in frequency data.

What was the error found in the tally chart for Monday?

• The tally count was higher than the frequency column.

• The tally count was lower than the frequency column.

• The tally count matched the frequency column.

• The tally count was missing.

In the pictogram, what does half a symbol incorrectly represent?

• 2 CDs

• 3 CDs

• 1.5 CDs

• 1 CD

Why is it important to have a key in a pictogram?

• To determine the size of the symbols

• To count the number of symbols

• To understand what each symbol represents

• To identify the colors used

What is the correct frequency for Tuesday according to the pictogram?

• 15 CDs

• 12 CDs

• 18 CDs

• 21 CDs

What should you do to ensure full marks on such questions?

• Ignore the given information

• Guess the answers

• Read the question and information carefully

• Write down all possible mistakes