a bag contains 7 red marbles, 8 blue marbles and 4 green marbles. what is the probablity of choosing a blue marble?
7+8+4 = 19
so 8/19
To find the probability of choosing a blue marble, we need to determine the total number of marbles in the bag, as well as the number of blue marbles.
Total number of marbles = 7 (red) + 8 (blue) + 4 (green) = 19
Number of blue marbles = 8
Now, we can calculate the probability of choosing a blue marble:
Probability of choosing a blue marble = Number of blue marbles / Total number of marbles
= 8 / 19
≈ 0.421 (rounded to three decimal places)
Therefore, the probability of choosing a blue marble is approximately 0.421.
To find the probability of choosing a blue marble, we need to know the total number of marbles in the bag and the number of blue marbles.
In this case, the total number of marbles is the sum of the number of red, blue, and green marbles: 7 + 8 + 4 = 19.
Therefore, the probability of choosing a blue marble can be calculated by dividing the number of blue marbles by the total number of marbles:
Probability of choosing a blue marble = Number of blue marbles / Total number of marbles
Probability of choosing a blue marble = 8 / 19
Hence, the probability of choosing a blue marble is 8/19.