Question

quiz 6.4.1 - adding probabilities
this quiz will test your knowledge on when and how to add probabilities together.
value 3
a bag contains five red marbles, four blue marbles, and four yellow marbles. you randomly pick a marble. what is the probability that the marble is red or blue?
a. 8/13
b. 9/26
c. 20/169
d. 9/13

Explanation:

Step1: Calculate total number of marbles

$5 + 4+4=13$

Step2: Calculate number of red or blue marbles

$5 + 4 = 9$

Step3: Calculate probability

The probability of picking a red or blue marble is $\frac{9}{13}$

Answer:

d. 9/13