Question

What is the probability that a normal random variable will take a value that is less...

What is the probability that a normal random variable will take a value that is less than 1.05 standard deviations above its mean? In other words, what is P(Z < 1.05)?

  • .8531
  • .1468
  • .9332
  • .0668

What is the probability that a normal random variable will take a value that is between 1.5 standard deviations below the mean and 2.5 standard deviations above the mean? In other words, what is P(-1.5 < Z < 2.5)?

  • .9938
  • .0668
  • .9270
  • .0730

What is the probability that a normal random variable will take a value that is more than 2.55 standard deviations above its mean? In other words, what is P(Z > 2.55)?

  • .9945
  • .9946
  • .0055
  • .0054

Math   Statistics-And-Probability   
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