A jar contains 7 red, 5 blue, and 8 green marbles. What is the probability of selecting a blue marble?
Practice Questions
1 question
Q1
A jar contains 7 red, 5 blue, and 8 green marbles. What is the probability of selecting a blue marble?
5/20
1/4
1/5
1/3
Total marbles = 7 + 5 + 8 = 20. Probability of blue marble = 5/20 = 1/4.
Questions & Step-by-step Solutions
1 item
Q
Q: A jar contains 7 red, 5 blue, and 8 green marbles. What is the probability of selecting a blue marble?
Solution: Total marbles = 7 + 5 + 8 = 20. Probability of blue marble = 5/20 = 1/4.
Steps: 6
Step 1: Count the number of red marbles. There are 7 red marbles.
Step 2: Count the number of blue marbles. There are 5 blue marbles.
Step 3: Count the number of green marbles. There are 8 green marbles.
Step 4: Add the number of all marbles together: 7 (red) + 5 (blue) + 8 (green) = 20 total marbles.
Step 5: Identify how many of the total marbles are blue. There are 5 blue marbles.
Step 6: Calculate the probability of selecting a blue marble by dividing the number of blue marbles by the total number of marbles: 5 (blue) / 20 (total) = 1/4.
