The shelf life of a battery produced by one major company is known to be normally distributed, with a mean life of 3.7 years and a standard deviation of 0.8 years. This problem uses the expanded empirical rule. The rule adds one additional part to the standard 68-95-99.7 values. The expanded empirical rule tells us that 50% of the distribution falls between a z-score of -0.67 and a z-score of +0.67. Using the expanded empirical rule, what is the probability in decimal form that a randomly chosen battery will (a) last more than 6.1 years? Answer: (b) last fewer than 2.9 years? Answer: (C) last between 3.164 and 4.236 years? Answer:

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