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7
a black one
Total number of marbles in the bag = 6 + 19 + 5 + 19 + 17 = 66Number of yellow ones = 19If drawing perfectly randomly, then the probability of pulling a yellow one = 19/66 = 28.8% (rounded)
25%
45 __ 91
7
a black one
The probability of selecting a red marble is 3/9
The probability is 0.56
Total number of marbles in the bag = 6 + 19 + 5 + 19 + 17 = 66Number of yellow ones = 19If drawing perfectly randomly, then the probability of pulling a yellow one = 19/66 = 28.8% (rounded)
The theoretical probability of randomly picking each color marble is the number of color marbles you have for each color, divided by the total number of marbles. For example, the probability of selecting a red marble is 3/20.
25%
25
45 __ 91
There are 8 marbles that aren't black, out of a total of 12 marbles, so the probability is 8/12 or 2/3.
1 in 52
2/9