Question
he probability that Alanna's train will be late is (1)/(10) If Alanna takes he train 30 times what is the expected number of times her train will be late?
Answer
4.7
(236 Votes)
Douglas
Master · Tutor for 5 years
Answer
3
Explanation
In probability, the expected value of a random variable shows a long-term scenario or a trend. Simply, it predicts the most likely outcome over many trials. Here, our random variable is whether Alanna's train is late or not for each ride. With a
late-probability each ride, we would expect this proportion to hold over many trials. That is,
of all train rides would be expected to be late. To find out how many out of 30 trips, we just multiply
times 30.