Item1 12 points Time Remaining 2 hours 18 minutes 22 seconds02:18:22 Item 1 Time Remaining 2 hours 18 minutes 22 seconds02:18:22 AB Volvo services trucks at its regional service center. Trucks arrive to the service center for repairs and preventive maintenance every 2.1 hours on average with a standard deviation of 2.1 hours. Once a truck reaches the front of the line, it is assigned to one of 3 service teams that diagnose the problem and complete the service. On average it takes the service team 5.17 hours to complete the service. The coefficient of variation (CV) for service is 0.8. Assume the service center operates 24 hours per day. Rounding instructions Carry all calculations to at least 3 decimal places. Enter all answers rounded to one decimal place, e. g. nearest tenth of an hour, truck, etc. Enter utilization as a percentage rounded to the nearest tenth of a percent - e. g. 0.6543 should be entered as 65.4%. a) Compute the average time a truck spends waiting to be assigned to a service team

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i took the test: )

answer: it's d

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answer: c, the green line

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there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.

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