Math Solutions

(Steps Shown) Wasatch Wireless manufactures a deluxe cell phone model which can retain its battery charge for a population mean average of 20 hours with a

Question: Wasatch Wireless manufactures a deluxe cell phone model which can retain its battery charge for a population mean average of 20 hours with a population standard deviation of 4 hours. The continuous random variable, x, represents the length of time the charge lasts, and is found to be normally distributed. [COMMENTS & HINTS: When answering the following questions, draw a diagram of the distribution.]

  1. What is the probability that the battery for a randomly selected cell phone manufactured by Wasatch Wireless retains its charge for at least 13 hours but less than 31 hours?
  2. What is the probability that the battery for a randomly selected cell phone manufactured by Wasatch Wireless retains its charge for more than 27.5 hours?

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