Risk-Education

how does risk apply to me? – a work and website of the Chemical Industry Education Centre CIEC, University of York, UK

Everything we do is risky. Things can go right or things can go wrong. Life would be boring if everything was 100% predictable.
This site is designed to improve your understanding of risk, to help you evaluate different risks and to take decisions for yourself. (Homepage).

Risk Scale; Hazards; Life examples; Quizzes; Links;
Address: Risk-Ed – RISK, Chemical Industry Education Centre, Chemical Industry Education Centre, University of York, Heslington, York (UK), YO10 5DD, UK ;
Contact (down contact site of CIEC).

Probabilities and outcomes: When an event has more than one outcome, what do the probabilities of each outcome add up to?

Looking at the roll of a dice:

  • The probability of throwing a 1 is 1 in 6. This can be written as 1/6 or 0.1666.
  • The probability of throwing a 2 is 1 in 6. This can be written as 1/6 or 0.1666.
  • Think about the probabilities of rolling a 3, 4, 5, or 6.
  • So if you look at all the possible outcomes, the total of all their probabilities must add up to 1. This could be thought of by saying that it is absolutely definite that when you roll a dice you wil get a 1 or 2 or 3 or 4 or 5 or 6.
  • Knowing one probability allows another to be calculated Remember that the total of probabilites for a particular event add up to 1.

So what are these probabilities?

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