Podcast
Questions and Answers
What is the new price of a coffee machine that initially cost €79.85 after a 6.2% increase?
What is the new price of a coffee machine that initially cost €79.85 after a 6.2% increase?
How many students were there at the school after a 2.3% decrease from an initial population of 953?
How many students were there at the school after a 2.3% decrease from an initial population of 953?
What was the percentage increase in the price of gasoline when it rose from €1.93 to €2.02?
What was the percentage increase in the price of gasoline when it rose from €1.93 to €2.02?
What is the percentage discount when a ticket price drops from €28.50 to €12.99?
What is the percentage discount when a ticket price drops from €28.50 to €12.99?
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What do histograms represent?
What do histograms represent?
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Which of the following measures is defined as the most frequently occurring number in a dataset?
Which of the following measures is defined as the most frequently occurring number in a dataset?
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In a bar chart, which information is typically represented?
In a bar chart, which information is typically represented?
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How is the mean of a dataset calculated?
How is the mean of a dataset calculated?
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Study Notes
Calculating with percentages
- A coffee machine costs €79.85 and increases by 6.2%.
- The new price is €84.80.
- 953 students are enrolled in a school.
- A year later, the number of students decreased by 2.3%.
- There are now 931 students.
Percentage change
- The price of a litre of petrol is €2.02.
- Last month, it was €1.93.
- The increase was €0.09.
- The percentage increase was 4.7%.
- A ticket to the Dolfinarium costs €28.50.
- With a discount, the ticket price is €12.99.
- The discount is €15.51 (€28.50 - €12.99).
- The percentage discount is 54.4%.
Histograms and Frequency Tables
- Histograms show the frequency (how often) a value appears in a dataset over time.
- The horizontal axis represents time.
- The vertical axis represents the frequency of the values at a particular point in time.
- A frequency table shows the number of times each value is observed in a dataset.
- A histogram can be made from a frequency table, to display the data visually.
- The data in the table relates to the number of children of the employees at Shipyard Delfshaven.
Measures of central tendency
- The mean (average) is calculated by summing all values and dividing by the total number of values.
- The median is the middle value when the data is ordered from least to greatest.
- The mode is the value that occurs most often.
- The data relates to the number of goals scored by Feyenoord.
- The mean number of goals scored by Feyenoord is 1.9 per game.
- The median is 2.
- The mode is 2.
Types of charts
- A bar graph displays categorical data using bars of different heights to represent frequencies.
- A circle graph compares parts to the whole.
- Examples of the data include types of ships built by a company.
- The data demonstrates the breakdown by type (sailboat, motorboat, etc.).
Statistical Data
- Statistical data is collected, organized, and analyzed in tables and graphs.
- These tables and graphs represent data.
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Description
This quiz focuses on calculating percentage changes and understanding histograms and frequency tables. You'll encounter real-world examples, such as price increases and student enrollments, to test your skills in these concepts. Prepare to analyze data visually as well as numerically.
