An athlete suspected of having used steroids is given two tests that operate independently of each other. Test A has probability 0.9 of being positive if steroids have been used. Test B has probability 0.8 of being positive if steroids have been used. What is the probability that atleast one test is positive if steroids have been used?

0.82

Step-by-step explanation:

given that an athlete suspected of having used steroids is given two tests that operate independently of each other.

Test A has probability 0.9 of being positive if steroids have been used. Test B has probability 0.8 of being positive if steroids have been used.

A and B are independent of each other

Hence P(AB) = P(A) P(B)

Required probability = the probability that atleast one test is positive if steroids have been used

= P(AUB)

= P(A)+P(B)-P(AB)

= 0.9+0.8-0.9*0.8

= 0.82

the answer is a.

135 and 80

step-by-step explanation:

twenty-six miles over two gallons because the proportion for the original 13 miles to one gallon would be written 13/1 and, doing the same thing to the top and bottom, i multiplied by 2 and got 26/2