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Mathematics 7 Online
OpenStudy (anonymous):

94 x 49 x 3

OpenStudy (bibby):

and implies multiplication. What are the chances of getting question 3 incorrectly?

OpenStudy (anonymous):

3/16? @bibby

OpenStudy (bibby):

There are 4 possible choices and another 2 all of these or none of these. It's a multiple choice test so ONLY 1 out of all 6 is correct. Thus her chances at get 3 incorrect are 5/6

OpenStudy (anonymous):

5/36?

OpenStudy (bibby):

yeah

OpenStudy (anonymous):

how can i be sure though?

OpenStudy (bibby):

I'm not sure. I just know, because it's basic probability. Logically, it's true. The probability of A and B is always P(a)*P(b) 5/6*1/6=5/36

OpenStudy (bibby):

Just remember these 2 ideas, OR = add, AND = multiply add the probability of getting red, green, and blue

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