Question

Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal...



Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal place

x P(x)
0 0.3
1 0.05
2 0.3
3 0.35

2.) A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.2 years, and standard deviation of 2.5 years.

If you randomly purchase one item, what is the probability it will last longer than 9 years?

Round answer to three decimal places

Math   Statistics-And-Probability   
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