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The lifespan of a laptop is normally distributed with a mean of 6.5 years and a...

The lifespan of a laptop is normally distributed with a mean of 6.5 years and a standard deviation of 1.6 years. What percent of laptops last:

20. At least 5 years? Hundredths

21. Less than 8 years? Hundredths

22. Between 6 and 9 years? Hundredths

23. More than 5 years? Hundredths

24. What lifespan represents the top 5%? Tenths

Math   Statistics-And-Probability   
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