Starter quiz
- Which of these frequency tables shows 49 pieces of data?
- The bar chart shows the number of children who have visited different attractions in the summer holidays. The bar for ______ has a frequency of 12.
- 'Zoo' ✓
- Laura times her bus journey to school every day for a week. On which day did Laura's journey take 28 minutes?
- Monday
- Tuesday
- Wednesday
- Thursday ✓
- Friday
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- A measure of central tendency is a summary measure that attempts to describe a whole set of ______ with a single value that represents the middle or centre of its distribution.
- 'data' ✓
- A large data set has 452 data values which have a total of 16 724. The mean of the data is ______.
- '37' ✓
- The mean for the data shown on this dot plot is ______.
- '6' ✓
Exit quiz
- Select all the data sets that have a mean.
- 4, 5, 8, 0, 2, 5 ✓
- 3.1, 4.4, 7.3, 8.0, 9.4 ✓
- tea, coffee, tea, tea, coffee, tea, water
- -6, -4, -3, -8, 4, 7, 8 ✓
- rose, tulip, daffodil
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- The (arithmetic) mean for a set of ______ data is the sum of the values divided by the number of values. It is a measure of central tendency representing the average of the values.
- 'numerical' ✓
- Without any further calculation, which of these could be the mean?
- 2.53 ✓
- 10
- 16
- 58
- 147
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- Laura records how long her journey is to school each day for a week. The line graph shows her results. Laura's mean journey time is ______ minutes.
- '28.2' ✓
- The bar chart shows the number of goals scored by a club in a season. 192 goals were scored in total. The mean number of goals per match is ______ rounded to 1 decimal place.
- '2.2' ✓
- Which of these calculations is correct for finding the mean from this frequency table?
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- ✓
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Worksheet
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Presentation
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Lesson Details
Key learning points
- The mean can be calculated from a line graph.
- The mean can be calculated from an ungrouped frequency table.
- The mean can be calculated from a bar chart.
Common misconception
Pupils may divide by how many groups/bars there are, instead of the total frequency.
By reminding students frequently that averages need to give a 'typical' value of the data set, ask them to sense check their mean value.
Keywords
Frequency - The frequency is the number of times an event occurs; or the number of individuals (people, animals etc.) with some specific property.
Data - Data are a collection of information.
Mean - The sum of the values divided by the number of values. It is a measure of central tendency representing the average of the values.
Measure of central tendency - A summary measure that attempts to describe a whole set of data with a single value that represents the middle of the distribution.
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