Averages and spreadIB MYP Maths Extended: Flashcards
What these 15 flashcards ask
- How do you find the mean?
- How do you find the median?
- What is the mode?
- How do you find the range?
- What does the range measure?
- Mean from a frequency table?
- In a frequency table, what is the mode?
- Median with 20 values?
- How do you estimate the mean of grouped data?
- Why is the mean of grouped data only an estimate?
- What is the modal class?
- Which average is best when there is an outlier?
- Which average can be used for categorical data?
- What two things should you compare for two data sets?
- What does a smaller range tell you?
Exam questions on Averages and spread
- The ages, in years, of seven members of a chess club are 12, 15, 13, 12, 40, 14 and 12.Explain which average best represents the typical age of the members.2 marks
- A football team's goals scored per match over 20 matches: 0 goals in 4 matches, 1 goal in 6 matches, 2 goals in 5 matches, 3 goals in 3 matches and 4 goals in 2 matches.Find the mean number of goals per match.2 marks
- The heights of 40 plants are recorded in a grouped frequency table. In centimetres, 4 plants are in the class 0 ≤ h < 10, 10 plants in 10 ≤ h < 20, 15 plants in 20 ≤ h < 30, 8 plants in 30 ≤ h < 40 and 3 plants in 40 ≤ h < 50.Write down the modal class. Show that the median height lies in the class .3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).