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The mean of a normal probability distribution is 360; the standard deviation is 50. Refer to...

The mean of a normal probability distribution is 360; the standard deviation is 50. Refer to the table in Appendix B.1. (Round the final answers to 2 decimal places.)   

a. About what percentage of the observations lie between 310 and 410?

Percentage of observations          %

b. About what percentage of the observations lie between 260 and 460?

   

Percentage of observations          %

c. About what percentage of the observations lie between 210 and 510?

   

Percentage of observations          %

Math   Statistics-And-Probability   
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