# Probability and Percentage increases and decreases

Following our assessment task yesterday it is clear that some students need to revise certain areas of the work we have done in term 1 and 2:

Probability – Relative frequency with ten questions to complete.

Percentages – How to convert fractions and percentages to a pie chart (360 degrees) with ten questions to complete.

Percentage increases and decreases – Worked examples and five problems to solve.

Stem and Leaf plotsWorked example and thirteen questions to solve.

Problem #1: You have a list of 7 numbers. The average of the numbers is 9. If you take away one of the numbers, the average of the numbers is 8. What number did you take away?

Problem #2: Martin has completed five Maths tests and received an average score of 80%. What is the highest average he could have after the next test?

Problem #3: A Year 7 class was asked “How many goals did you shoot at lunchtime?”. The lowest answer was 5 and the highest answer was 20. The total of all the answers was 60. What is the smallest number of students who could have been asked?

# Preparing for Potato Olympics!

Today was spent preparing our Olympians for competition – the final vital statistics were recorded and trainers completed a dossier of biographical information about their potatoes. Students have chosen the countries that their potatoes will compete for and found out about the event they are responsible for organising. We are using a wiki and Google Docs forms and spreadsheets to share our results of the events. Students will be required to answer the following questions:

• What are the mean heights, girths, masses and volumes of Hawkesdale potatoes and of St. Aloysius potatoes?
• What are the median heights, girths, masses and volumes of both school’s potatoes?
• What is the range of heights, girths, masses and volumes of both school’s potatoes?
• Who had the tallest, shortest, widest, narrowest, heaviest, lightest, biggest and smallest potatoes?

We hope to be able to do a Skype link-up with St. Aloysius this week, when we can celebate the results of our inaugural Potato Olympics!