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The mean of a normal probability distribution is 340; the standard deviation is 45. Refer to the table in Appendix B.1 . (Round the final

The mean of a normal probability distribution is 340; the standard deviation is 45. 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 295 and 385?

Percentage of observations %

b. About what percentage of the observations lie between 250 and 430?

Percentage of observations %

c. About what percentage of the observations lie between 205 and 475?

Percentage of observations %

Please help me with this question,

Thank you!

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