Wednesday September 5th: LI: We are learning to express probability as a fraction, decimal or percentage. SC: I can express the probability of an event occurring as a fraction.
Warm Up: With your 2 O'Clock partner, have a look at these two fictitious magazine covers. Read the covers carefully. What statements do you notice that involve chance and uncertainty?
With your partner, choose the 5 most interesting statements (from either magazine) and complete the “Statements of Chance” page.
Introduction: Chance, or probability, can be expressed as a fraction, decimal or percentage. Can you find examples of this on the magazine covers?
Activity: Expressing Probabilities. In a chance experiment with equally likely outcomes (as in choosing a number randomly from the hundreds chart), the probability of an event is equal to the fraction of outcomes that are favourable. What does this mean? To complete this task, you will need to count the number of favourable outcomes on your hundreds chart. Start by recording it as a fraction. If you are confident, have a go at recording this as a decimal and percentage also. Finished? Make up some more possible outcomes to challenge a friend. Make sure you know the answers!
Once everyone is finished we will work through the answers together. If you weren’t sure about converting to decimals and percentages, you will be able to complete this as we do it together.
Reflection: Levels of Understanding
Lesson 2: LI: We are learning to conduct chance experiments with both small and large numbers of trials, and compare observed frequencies with expected frequencies.
SC: I can describe what happens to data variability when sample size is increased, and explain why it is important to know the size of a sample.
Display on the whiteboard and do several trials with each set, so that students can see what is happening to the display. Observe the changes between the results as the sample size gets bigger. Ie: Relative frequencies get closer to the theoretical probability