Question

Help please no rush

Answer 1

To solve this, we take the number of subjects who weren't diabetic, and then divide them by the total number of subjects who took the test:

Probability = $\frac{28}{3+28}$
                   = $\frac{28}{31}$
                   = 0.903225..
                   = 0.90 (rounded)
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Answer:

So the probability of randomly selecting a subject who was not diabetic would be 0.90 (the final option)

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Note:
         We only used the numbers under 'Negative Test', because the question wanted the probability 'given that the test result was negative'