A statistical analysis is made of final scores in a largecourse, with the follow

Question

A statistical analysis is made of final scores in a largecourse, with the followeing results:                        averagefinal score = 65,    SD = 20 And the final scores followed the normal curve. a) About what percentage of students scored over 75 on thefinal? b) About what percentage of students scored over 70 on thefinal? A statistical analysis is made of final scores in a largecourse, with the followeing results:                        averagefinal score = 65,    SD = 20 And the final scores followed the normal curve. a) About what percentage of students scored over 75 on thefinal? b) About what percentage of students scored over 70 on thefinal?

Explanation / Answer

              average final score = 65,    SD = 20 And the final scores followed the normal curve. a) About what percentage of students scored over 75 on thefinal? To do this problem you need to use the followingformula: Z = (X - M) / SD Z = (75 - 65) / 20 Z = 0.5 this then is used with the Z table to get 0.1915 Because you want over 75 you need to subtract 0.1915 from 0.5this will be your answer! b) About what percentage of students scored over 70 on thefinal? To do this problem you need to use the followingformula: Z = (X - M) / SD Z = (70 - 65) / 20 Z = 0.25 this then is used with the Z table to get0.0987 Because you want over 70 you need to subtract 0.0987 from 0.5this will be your answer! To do this problem you need to use the followingformula: Z = (X - M) / SD Z = (70 - 65) / 20 Z = 0.25 this then is used with the Z table to get0.0987 Because you want over 70 you need to subtract 0.0987 from 0.5this will be your answer!

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