In any 15-minute interval, there is a 20% probability that you will see at least one shooting star. What is the probability that you see at least one shooting star in the period of an hour?

1 Answers

Probability of not seeing any shooting star in 15 minutes is

= 1 – P( Seeing one shooting star )

= 1 – 0.2 = 0.8

Probability of not seeing any shooting star in the period of one hour

= (0.8) ^ 4 = 0.4096

Probability of seeing at least one shooting star in the one hour

= 1 – P( Not seeing any star )

= 1 – 0.4096 = 0.5904