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Simple statistics question.

Help with a probability/statistics question?

  • I'm going to be doing the AQA Statistics B A level paper this Friday, and i'm unsure about probability... I just need a bit of help with it. I have a specific question but if you have any general rules that could apply to any question, please let me know. So my question is about two twins and a football team The probability that person A is selected is 0.85 The probability that person B is selected is 0.6 The probability that both are selected is 0.55 What is the probability that neither are selected? Thanks in advance. :-)

  • Answer:

    Draw a Venn diagram, it will help. P(AuB)= P(A) + P(B) - P(AnB) = 0.85 + 0.6 - 0.55 = 0.9 Therefore, probablility that neither are selected = 1 - 0.9 = 0.1

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The probability that neither are selected = 1 - [P(A) + P(B) - P(A∩B)] = 1 - [0.85 + 0.6 - 0.55] = 1 - 0.9 = 0.1

help4u

To find the probability of NEITHER for them being selected 1- (.85+.6-.55) = 0.1

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