Billy takes two tests in his probability class. The probability that Billy would pass at least one test is 0.9. The probability that he passes both tests is 0.7. The tests are of equal difficulty (that is, the probability that Billy passes test 1 is the same as the probability that he passes test 2.) What is the conditional probability of Billy passing test 2 given the event that he passes test 1

⅞ or 0.875

Step-by-step explanation:

0.9 = p(1) + p(2) - 0.7

1.6 = 2p(1)

P(1) = 0.8

P(2/1) = P(both)/P(1) = 0.7/0.8

= 7/8 or 0.875

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you

a: 1/6, j: 1/4

step-by-step explanation: you are welcome