GCSE Secondary Maths Age 13-17 - Probability & Statistics: Probability - Explained

The video tutorial explains how to calculate the probability of a new fridge not having a fault, given the probability of it having a fault. It covers basic probability concepts, emphasizing that probabilities must add up to one. The tutorial demonstrates the calculation by subtracting the fault probability from one, resulting in a non-fault probability of 0.985. It concludes with a reminder to always subtract the given probability from one to find the complementary probability.

What is the given probability that a new fridge has a fault?

• 0.015

• 0.0015

• 0.15

• 0.105

If the probability of a fridge having a fault is 0.015, what is the probability of it not having a fault?

• 0.95

• 0.015

• 0.985

• 0.105

How do you calculate the probability of a fridge not having a fault if the fault probability is known?

• Subtract the fault probability from 1

• Divide the fault probability by 1

• Multiply the fault probability by 1

• Add the fault probability to 1

What must the sum of all probabilities equal?

• 0

• 2

• 1

• 0.5

If you know the probability of an event occurring, how can you find the probability of it not occurring?

• Add the given probability to 0.5

• Divide the given probability by 0.5

• Subtract the given probability from 1

• Multiply the given probability by 2