Solve the problem.Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 10 trains per hour 
per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t) = 1 - e-0.17tDetermine how many minutes are needed for the probability to reach 80%.
A. 9.47 min
B. 4.73 min
C. 6.98 min
D. 1.09 min
Answer: A
You might also like to view...
Solve the problem.Plot the point 
and find other polar coordinates (r, ?) of the point for which:(a) r > 0, -2? ? ? < 0(b) r < 0, 0 ? ? < 2?(c) r > 0 2? ? ? < 4?
What will be an ideal response?
Evaluate.Let a = (cos ?)i + (sin ?)j , b = 
i + 
j. Find a + b.
A. i - j B. -i - j C. -i + j D. i + j
Solve the problem.A portion of Road A declines steadily for 200 feet over a horizontal distance of 2400 feet. A portion of Road B declines steadily for 360 feet over a horizontal distance of 4200 feet. Which road is steeper?
A. Road B B. Road A C. Neither
Write the numeral in the following problem as a decimal numeral. By decimal numeral, we mean the system we use in everyday arithmetic. ? DCCIX ?
A. 709 B. 48 C. 1,997 D. 2,001 E. 719