18. Company XYZ know that replacement times for the portable MP3 players it produces are normally distributed with a mean of 3.2 years and a standard deviation of 0.4 years. Find the probability that a randomly selected portable MP3 player will have a replacement time less than 2 years? Report your answer accurate to 4 decimal places

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Q: hours. If exactly 98% of the bulbs die before 925 hours, find the mean lifet

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