What is the probability that a battery of supporting all chosen at random will last over 610 hours?
Bear all, a manufacturer states that the battery life of your batteries is normally distributed with an average of 500 hours and a standard deviation of 40 hours What is the probability that a battery of supporting all chosen at random will last over 610 hours? a) 0.0228 b) 0.0030 c) 0.0035 d) 0.9965 and) 0.9970 f) None of the above.
1. Requires Z reference to Table 2. z = [610-500] / 40 = 2.75 3. Probability Table z for z> = 2.75 = 0.0030 ANS: (B) 0.0030
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