The mean of a normal probability distribution is 560; the standard deviation is 100. Refer to the table in Appendix B.1. (Round the final answers to 2 decimal places.)

Question

The mean of a normal probability distribution is 560; the standard deviation is 100. 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 460 and 660?

 

Percentage of observations          %

 

b. About what percentage of the observations lie between 360 and 760?

   

Percentage of observations          %

 

c. About what percentage of the observations lie between 260 and 860?

   

Percentage of observations          %

Answer 1

a) 68%

b) 95%

using the empirical rule 68-95-99.7

c) 99.7%