Answer:
c. 0.219
Step-by-step explanation:
If the coin is fair, then the probability of flipping a head is 1/2 = 0.5
Therefore, we can model this as a binomial distribution:
X ~ B(n, p) where n is the number of events and p is the probability of success
Given:
X ~ B(8, 0.5)
Using a calculator:
P(X = 5) = 0.21875 = 0.219 (3 dp)
Using the formula:
(where n is the number of events, x is the number of desired successes and p is the probability of success)
Each key is 1/5 the way for the door to be open
Answer: 3.3 mins
Step-by-step explanation:
If you add all of the time together (48+60+60+30=198) and there is 60 seconds in a minute, 198 divided by 60 = 3.3 which is 3 minutes and 30 seconds
20 laps...each lap is 400 yds.....20 x 400 = 8000 yds
1680/8000 = 0.21....multiply by 100 to get ur percent = (0.21 x 100) = 21%