Homework Help: Algebra 1

Posted by Zach on Thursday, November 5, 2009 at 11:04pm.

Mary's class took two tests last week. 80% of the class passed the math test, 90% of the class passed the English test, and 72% of the class passed both. What is the probablility that a randomly selected student in Mary's class failed both tests? Express your answer as a percent rounded to the nearest tenth of a percent?
Thanks
-Zach

Algebra 1 - Reiny, Thursday, November 5, 2009 at 11:11pm
Prob(Math OR English)
= P(M) + P(E) - P(M and E)
= .8 + .9 - .72
= .98

Prob (failing both) = 1 - .98
= .02
Algebra 1 - Zach, Thursday, November 5, 2009 at 11:26pm
Thanks

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