(Answered) For thanksgiving there were 837 trotters that participated

Statistics

For Thanksgiving, there were 837 trotters that participated in a turkey trot and ran a 15-mile course on the weekend before Thanksgiving as a screening test to see if they were ready to complete the actual 26-mile turkey trot 3 weeks later. All of the 837 runners ran in the turkey trot, but only 820 finished. The sensitivity for the 15-mile screening trot was 94% and the specificity 90%.

How many trotters completed the screening run?
What was the positive predictive value of the screening run?
How many trotters did not complete the screening run or the marathon?

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