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for problems 2 through 5. use this information about the results of a statistics test:
on a statistics test for a group of 50 students, the grades were normally distributed
the mean grade was 75, and the standard deviation was 6.
2. janis scored 80 on this test.
a. what was her z-score for this grade?
b. what percent of the class scored lower than janis?
c. approximately how many students in the class scored lower than janis?
3. the minimum passing grade on this test was 70. approximately how many students
scored lower than 70 on this test?
4. to receive an "a" on this test, a minimum grade of 90 was required. how many
students scored above 90?
5. ronnie's grade was the 92nd percentile, 92, for this test.
a. this means that percent of students in the class scored lower than ronnie,
and percent of students scored higher than ronnie.
b. what was ronnie's grade on this test?