A capacitor has a voltage rating of 750 volts. Normal voltage is continuously applied at 120 volts..

A capacitor has a voltage rating of 750 volts. Normal
voltage is continuously applied at 120 volts. Power spikes occur on the average
of 5 per yr (Poisson distributed) and have an exponential distribution with a
mean of 250 volts. Find R( one month) and the MTTF.