The standard deviation of the lifetime of a washing machine

Reference no: EM131167073

The lifetime of a certain manufacturer's washing machine is normally distributed with mean 4 years.

Only 15% of all these washing machines last at least 5 years.

What is the standard deviation of the lifetime of a washing machine made by this manufacturer?

Reference no: EM131167073

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The standard deviation of the lifetime of a washing machine : Only 15% of all these washing machines last at least 5 years.- What is the standard deviation of the lifetime of a washing machine made by this manufacturer?

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