The number of times a particular data value occurs is known as the frequency. A frequency table is used to organise data and determine the number of times a particular data value occurs.

The marks obtained in the Grade 8 Mathematics test are:
33, 23, 38, 34, 90, 51, 80, 87, 43, 37
58, 65, 17, 45, 70, 53, 91, 23, 37, 96
89, 15, 17, 64, 96, 1, 57, 6, 13, 74
80, 98, 63, 88, 81, 78, 81, 88, 93, 68
There are a total of 40 marks.

The lowest mark is 1 and the highest mark is 98. We will use class intervals of 10, starting from 0.
The intervals are: $0-9$, $10-19$, $20-29$, $30-39$, $40-49$, $50-59$, $60-69$, $70-79$, $80-89$, $90-99$.

• $0-9$: 1, 6 (2 marks)
• $10-19$: 17, 15, 17, 13 (4 marks)
• $20-29$: 23, 23 (2 marks)
• $30-39$: 33, 38, 34, 37, 37 (5 marks)
• $40-49$: 43, 45 (2 marks)
• $50-59$: 51, 53, 57, 58 (4 marks)
• $60-69$: 65, 64, 63, 68 (4 marks)
• $70-79$: 70, 74, 78 (3 marks)
• $80-89$: 80, 87, 89, 80, 81, 88, 81, 88 (8 marks)
• $90-99$: 90, 91, 96, 96, 98, 93 (6 marks)

The final answer is $\boxed{\text{The tally and frequency table for the marks is shown above.}}$.
What's next?