Statistics Solutions

[Solution Library] Answer the questions about the specified normal distribution. (References: example 4 and 5 page 264 - 265, end of section exercises 39 - 45

Question: Answer the questions about the specified normal distribution. (References: example 4 and 5 page 264 - 265, end of section exercises 39 – 45 pages 267 - 268)

  1. The lifetime of ZZZ batteries are normally distributed with a mean of 280 hours and a standard deviation of 10 hours. Find the number of hours that represent the 25 th percentile. (5 points)
  2. Scores on an English placement test are normally distributed with a mean of 50 and standard deviation of 2.5. Find the score that marks the top 10%. (5 points)

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