A subway train makes six stops of equal length during its 21 km run. The train is actually moving for 20 minutes of the trip. At
most how long can the train remain at each station if the average speed for the trip, including stops, is to be at least 36 km/hr?
1 answer:
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Answer:
$ 7.7
Step-by-step explanation:
Given,
There are 18 $1 bills, ten $5 bills, eight $10 bills, three $20 bills, and one $100 bill,
Total number of bills = 18 + 10 + 8 + 3 + 1 = 40,
Thus,
The probability of $ 1 =
The probability of $ 5 =
The probability of $ 10 =
The probability of $ 20 =
The probability of $ 100 =
If a bill is selected randomly,
The expected value of the bill
= $ 7.7