Question

a marble is randomly drawn from a bag with 5 blue marbles, 8 red marbles, and 7 green marbles. event a: blue event b: green p(a or b) =? hint p(a or b) = p(a) + p(b) round your answer to the nearest hundredth.

Explanation:

Step1: Calculate total number of marbles

$5 + 8+7=20$

Step2: Calculate P(A)

$P(A)=\frac{5}{20}$

Step3: Calculate P(B)

$P(B)=\frac{7}{20}$

Step4: Calculate P(A or B)

$P(A\ or\ B)=P(A)+P(B)=\frac{5}{20}+\frac{7}{20}=\frac{5 + 7}{20}=\frac{12}{20}=0.60$

Answer:

$0.60$