Cow’s milk produced near nuclear reactors can be tested for as little as 1.00 pCi of 131 per liter, to check for possible reactor leakage. What mass of 131 I has this activity?

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?