The following histogram displays the distribution of battery life (in hours) for a certain battery model used in cell phones: A. O 0.50 B. 0.68 Relative Frequency 0.35+ C. O 0.95 D. O 0.997 0.3 0.25 0.2 0.15 0.1- 0.05 0 8 Battery Le(hrs) 10 Suppose that battery life is a normal random variable with μ = 8 and o = 1.2. Using the standard deviation rule, what is the probability that a randomly chosen battery will last between 6.8 and 9.2 hours? 12

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