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Grade 8 · Math · Unit 13 of 14

Probability & Data

Chance, mean, median and mode

What your child practises

Counting outcomes, finding theoretical and experimental probabilities, predicting how often something will happen, and summarizing data with the mean, median and range.

Prince Edward Island Curriculum curriculum outcome: Statistics and Probability · outcomes, theoretical and experimental probability, and summarizing data

How we explain it

Children can open this short lesson before they practise.

  1. Probability = favourable outcomes ÷ all possible outcomes.
  2. Mean: add and divide. Median: the middle. Mode: the most common.
  3. Use whichever measure best describes the data.

Example: Find the mean of 3, 5, 6 and 10. Add: 3 + 5 + 6 + 10 = 24. Divide by 4: 24 ÷ 4 = 6. Answer: 6

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A shop sells 2 kinds of shirts and 6 kinds of pants. How many different outfits can you make with one of each?

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  2. Question 2

    A bag has 1 red, 3 blue and 6 green marbles. What is the probability of picking a blue marble? Type it as a fraction in lowest terms.

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  3. Question 3

    A bag has 1 red, 3 blue and 6 green marbles. What is the probability of NOT picking blue? Type a fraction in lowest terms.

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  4. Question 4

    Sam spins a spinner 40 times and it lands on green 33 times. What is the experimental probability of green? Type a fraction in lowest terms.

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  5. Question 5

    A spinner lands on blue with probability 1/2. About how many blue spins do you expect in 16 spins?

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  6. Question 6

    What is the median of 11, 6, 8, 12, 17?

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