Question

One jar holds 16 red marbles and 4 blue marbles. A second jar holds 75 white marbles and 25 blue marbles. What is the probability that a blue marble will be drawn from both jars?

Answer 1

Answer:

$\frac{1}{20}$

Step-by-step explanation:

Probability of BOTH BLUE is multiplication of the individual probabilities

• P(Blue) in first jar is $\frac{4}{16+4}=\frac{4}{20}=\frac{1}{5}$

• P(Blue) in the second jar is $\frac{25}{75+25}=\frac{25}{100}=\frac{1}{4}$

So, probability that a blue marble will be drawn from BOTH jars is $\frac{1}{5}*\frac{1}{4}=\frac{1}{20}$

Answer 2

 
1) 4 blue : 20 total of jar 1 = 0.2
2) 25 blue : 100 total of jar 2 = 0.25
3) 0.2 + 0.25 = 0.45 - probability that a blue marble will be drawn from both jars