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kupik [55]
3 years ago
8

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%
Mathematics
1 answer:
jarptica [38.1K]3 years ago
4 0
 <span>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%</span>
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