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 119 520 >= 800 931 >= 600 230 >= 400 200 L < 1000 L < 800 L < 600 L < 400 0.3195 .a 0.5805 .b 0.215 .C 0.9438 .d .do

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