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Assume Tchebychev's rule is exact, calculate the probability of having Covid 19 if the test says you have it if a) The background percentage of

Assume Tchebychev's rule is exact, calculate the probability of having Covid 19 if the test says you have it if

a) The background percentage of people with active covid 19 is .01

b) The background percentage of people with active covid 19 is .05

c)The background percentage of people with active covid 19 is .3

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