Question

Consider julie's scores on three final exams (x), along with the class means and standard deviations: subject x mean standard deviation history 75 70 5 english 92 90 10 math 80 70 3 science 84 70 7 compared to the other students who took the test, in what class is was julie's highest score?

Answer 1

Consider julie's scores on three final exams (x), along with the class means and standard deviations: subject x mean standard deviation history 75 70 5 english 92 90 10 math 80 70 3 science 84 70 7 compared to the other students who took the test, in what class is was julie's highest score?

Answer: In order to find in what class Julie's has scored highest, we need to find the z score corresponding to Julie's score. The subject who has the highest z score will indicate that Julie has scored highest in that subject.

Z score for History:

`z=(75-70)/(5) =1`

z score for english:

`z=(92-90)/(10) =0.2`

z score for math:

`z=(80-70)/(3) =3.33`

z score for science:

`z=(84-70)/(7) =2`

Since the z score for Math is highest, therefore, in Math class Julie's score is highest.