Question: 9. Battery lifetime is normally distributed for large samples. The mean lifetime is 50-!) days and the standard deviation is My} To the nearest percent,

9. Battery lifetime is normally distributed for large samples. The mean lifetime is 50-!) days and the standard deviation is My} To the nearest percent, what percent of batteries have lifetimes longer than m? 10. A shoe manufacturer collected data regarding men's shoe sizes and found that the distribution of sizes is normally distributed. If the mean shoe size is 10.5 and the standard deviation is 1.6, tind: a. the probability that a man's shoe size is greater than or equal to 11.5. b. the probability that a man's shoe size is greater than or equal to 12.5

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