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24 August, 12:13

If a denotes some event, what does upper a overbara denote? if p (a) equals=0.9930.993 , what is the value of p (upper a overbara ) ? if p (a) equals=0.9930.993 , is upper a overbara unlikely?

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  1. 24 August, 12:26
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    P (A) = 0.993 is the probability of event A

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    P (A) is the probability of not A (note that I am trying to place a bar over A. I hope you can see it, else it is because the editor did not show it as I intended)

    Then, use the fact that the probability of A plus the probability not A is equal to 1:

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    => P (A) + P (A) = 1

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    => P (A) = 1 - P (A) = 1 - 0.993 = 0.007

    So, the answers are:

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    1) P (A) = 0.07

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    2) Yes, A is unlikely because its probability is very low.
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