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jaycezhao jaycezhao
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6 years ago
The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 400 minutes?
 
  A) 0
  B) 0.023
  C) 0.159
  D) 0.977
  E) None of the above
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Ha d.Ha d.
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6 years ago
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