Question

a marble is randomly drawn from a bag that with 5 blue marbles, 8 red marbles and 7 green marbles. event a: red event b: blue 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)

$P(A)=\frac{8}{20}$

Step3: Calculate P(B)

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

Step4: Calculate P(A or B)

$P(A\ or\ B)=P(A)+P(B)=\frac{8}{20}+\frac{5}{20}=\frac{8 + 5}{20}=\frac{13}{20}=0.65$

Answer:

$0.65$