AI generatedProbabilityKey Stage 3

Finding a complementary probability

Finding a complementary probability.

  • Probability = favourable outcomes ÷ all outcomes when individual outcomes are equally likely.
  • A probability lies between 0 and 1; complementary probabilities sum to 1.
  • Experimental relative frequency estimates probability and can vary between samples.

Example 1

The probability that a bus is late is . Find the probability that it is not late.

Subtract the given probability from 1.

Example 2

The probability that a bus is late is . Find the probability that it is not late.

Subtract the given probability from 1.

Your turn

Question 1

The probability that a bus is late is . Find the probability that it is not late.

Check answer
Subtract the given probability from 1.
Question 2

The probability that a bus is late is . Find the probability that it is not late.

Check answer
Subtract the given probability from 1.
Question 3

The probability that a bus is late is . Find the probability that it is not late.

Check answer
Subtract the given probability from 1.
Question 4

The probability that a bus is late is . Find the probability that it is not late.

Check answer
Subtract the given probability from 1.
Question 5

The probability that a bus is late is . Find the probability that it is not late.

Check answer
Subtract the given probability from 1.