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Distribution of the average of monthly phone bills

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Reference no: EM132381327

Suppose that the monthly bills of a population of households are normally distributed with a mean of $90 and standard deviation of $20. sample of 25 households is taken from this population.

  1. What is the distribution of the average of their monthly phone bills?
  2. What is the probability that the average will exceed $100
  3. What dollar amount will this average exceed with probability of 0.10?

Reference no: EM132381327

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