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11 July, 14:26

A compact disc is designed to last an average of 4 years with a standard deviation of 0.8 years.

What is the probability that a CD will last less than 3 years?

1.11%

10.56%

86.65%

100%

+2
Answers (1)
  1. 11 July, 14:47
    -2
    100% because 4 - 0.8 is 3.2

    = 3.2 years
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