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Let X denote the length of life (in years) of a smart phone which is a...

Let X denote the length of life (in years) of a smart phone which is a normally distributed random variable with mean 4 years and variance of 9 years. According to this distribution what fraction of smart phones will fail within one year?

Options:

1. 0.1900

2. 0.1085

3. 0.1587

4. 0.1195

5. 0.1200

math   Statistics-And-Probability   
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