Question

13)Your company manufactures hot water heaters. The life spans of your product are known to be normally distributed with a mean of 13 years and a standard deviation of 1.5 years.

What is the probability that the mean life span in a group of 10 randomly selected hot water heaters is between 12 and 15 years? (Round to the nearest ten-thousandth.)

14) Your company manufactures hot water heaters. The life spans of your product are known to be normally distributed with a mean of 13 years and a standard deviation of 1.5 years. You want to set the warranty on your product so that you have to replace at most 5% of the hot water heaters that you sell. How many years should you claim on your warranty? Hint: Calculate the fifth percentile. (Round to the nearest hundredth.)Your company manufactures hot water heaters. The life spans of your product are known to be normally distributed with a mean of 13 years and a standard deviation of 1.5 years. You want to set the warranty on your product so that you have to replace at most 5% of the hot water heaters that you sell. How many years should you claim on your warranty? Hint: Calculate the fifth percentile. (Round to the nearest hundredth.)

Answer 1