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he mean of a normal probability distribution is 240; the standard deviation is 20. Refer to the table in Appendix B.1 . (Round the final

he mean of a normal probability distribution is 240; the standard deviation is 20. 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 220 and 260?

Percentage of observations %

b. About what percentage of the observations lie between 200 and 280?

Percentage of observations %

c. About what percentage of the observations lie between 180 and 300?

Percentage of observations %

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