Find the indicated probability. Express answers as decimals.
-A batch consists of 20 defective coils and 80 good ones. Find the probability of getting two good coils when two coils are randomly selected if the first selection is replaced before the second is made.
A)0.4
B)0.64
C)0.04
D)0.46

Question

Quizplus · Accepted Answer

The probability of selecting a good coil is 80/100 or 0.8. Since the first selection is replaced, the probability of selecting a good coil again is also 0.8. Therefore, the probability of selecting two good coils in a row with replacement is 0.8 * 0.8 = 0.64.

Find the Indicated Probability. Express Answers as Decimals