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4 November, 04:31

A compact disc is designed to last an average of 4 years with a standard deviation of 0.9 years. What is the probability that a CD will last less than 3 years?

1.11%

13.35%

86.65%

100%

+3
Answers (1)
  1. 4 November, 08:25
    0
    3 is 1.0 below the mean. That is 1.0 / 0.9, or 1.1111 ... standard deviations below the mean.

    So look up z < - 1.11 on your graphing calculator.

    It should be around 0.1335 or 13.35%
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