Question 972075: A jar contains 6 red marbles, 12 blue marbles, and 2 green marbles. If one marble is selected at random, find the probaility of select: A blue or a green marble
A jar contains 6 red marbles, 12 blue marbles, and 2 green marbles. If one marble is selected at random, find the probaility of select: A blue or a red marble
If two dice are rolled one time, find the probability of getting: A sum of 7
If two dice are rolled one time, find the probability of getting: A sum of 5 or 11
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! There are 20 marbles
Prob of blue is (12/20) and green is (2/20). There is no joint probability, so the answer is 0.7
For a blue and a red, the numerators are 12 and 6, so the probability is 0.9
There are 36 outcomes, and they form a pyramid with
roll 2=1
3=2
4=3
5=4
6=5
7=6
8=5
9=4
10=3
11=2
12=1
The probability of rolling a 7 is (1/6)
The probability of a 5 or a 11 is also (1/6) from the above.
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