Need help with a Math question about probability

Statistics
Tutor: None Selected Time limit: 1 Day

The data in the following table shows the outcomes of guilty and not guilty pleas in 1,008 criminal court cases. If two different defendants are randomly selected, what is the probability that they both entered guilty pleas? Guilty plea 376(sent to prison) 558 (Not sent to prison) Not guilty plea 55(Sent to Prison) 19 (Not sent to prison)

Dec 1st, 2015

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Guilty Not guilty
Sent to prison 376 55 431
Not sent to prison 558 19 577
TOTAL 934 74 1008
The probability of entering a guilty plea is 934/1008

Therefore the probability of the two entering guilty pledges is (934/1008)*(934/1008) = 0.8586 0R 85.86%



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Dec 1st, 2015

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