E-50 [ question # 3 ] // charmaine's.

E-50 Question # 3:
Find each probability if you choose one marble at random.





P.O [ Possible Outcomes ]
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T.P.O [ Total Possible Outcomes ]

P (black)
black marble / t.p.o
3/10 = 0.3 = 30 %
divide 3 by 10, you'll get 0.3 then multiply by 100 to get 30 %

P (not black)
not black marble / t.p.o
7/10 = 0.7 = 70 %
divide 7 by 10 and you'll get 0.7, multiply it by 100 to get 70 %

P (black or white)
3 black or 1 white / t.p.o
4/10 = 2/5 = 0.4 = 40 %
simplify 4/10 to 2/5. divide 2 by 5 to get 0.4 then multiply it by 100 to get 40 %

P (striped)
striped marble / t.p.o
6/10 = 3/5 = 0.6 = 60 %
simplify 6/10 to 3/5. divide 3 by 5 to get 0.6 then multiply it by 100 to get 60 %

P (not white)
not white marble / t.p.o
9/10 = 0.9 = 90 %
divide 9 by 10 to get 0.9 then multiply by 100, and you'll get 90 %

P (yellow)
0, because there is no yellow marble.

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To answer those questions, find the possible outcomes and the total possible outcomes. Now, divide P.O by T.P.O and to get the answer, multiply it by 100 to get the percentage.
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My Own Question:
There are 15 dress, 19 shirts, 3 hats and 8 pants left in the store. What is the probability of shirts and hats ?

ANSWER:
15 + 19 + 3 + 8 = 45 ( total possible outcomes )
22 / 45
First add all the possible outcomes to get the total possible outcomes. Divide 22 by 45 to get the answer, then multiply it by 100 to get the percentage which is 48.8%