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the probabilities and gain or loss

11.8.9 Question Help The probabies and gain or loss for using on a standardered test is shown in the table to the night Suppo
math   Statistics-And-Probability   
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Answer #1

Answer)

Expected value = sum of x*p(x)

= 1*(1/5) + (-1/4)*(4/5)

= 0

So expected gain or loss is 0

So it is disadvantageous to guess

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