Here's the question you clicked on:
senjuti.s
if a student passes a math test 65% of the time and a math quiz 85% of the time, what is the probability that the student passes at least one test or quiz?
wouldn't it be \[\frac{ 13 }{ 20 }\] for the math tests; And then \[\frac{ 17 }{ 20 }\] for the math quizzes?? you may want to check my work and get a second opinion
it would be 1, minus the probability that they pass no tests