he lifespan (L) of each of 2000 valves is measured and given Calculate the probability that the lifespan of a valve is more than 800 hours Lifespan (hours) Number L>= 1000 800L < 1000 600 L < 800 400L < 600 L < 400 O a. O b. 0.3195 O C. O d. 0.9438 0.5805 0.215 119 520 931 230 200

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