Averages and spreadIB MYP Maths Standard: Mind map

Exam questions on Averages and spread

1. 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
2. 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
3. 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 $20\leq h<30$.3 marks