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The mean of a normal probability distribution is 380; the standard deviation is 90.    a. μ...

The mean of a normal probability distribution is 380; the standard deviation is 90.   

a. μ ± 1σ of the observations lie between what two values?

Lower Value           

Upper Value           

b. μ ± 2σ of the observations lie between what two values?

   

Lower Value           

Upper Value           

c. μ ± 3σ of the observations lie between what two values?

Lower Value           

Upper Value           

Math   Statistics-And-Probability   
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