4. A company has four similar pieces of equipment that are serviced by a single maintenance team. Each unit of equipment operates an average of 75 minutes before requiring service. The average service time is 25 minutes.
The time the equipment is not operating results in a loss of $60/hour. The maintenance technician is paid $18/hour.
a) Service factor (four decimals), X = ___________.
b) Efficiency factor (four decimals, use the value in tables of X closest to your result from part a)), F = ___________.
c) Expected number of equipment units waiting to be attended by the technician (three decimal places), L = ______________ equipment units.
d) Average time, in minutes, that a unit of equipment has to wait for the technician to be attended to (two decimal places), W = ______________ minutes.
e) Probability that a unit of equipment has to wait for the technician to assist it when required (three decimals), D = ______________.
