A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30.
Following are the American College Test (ACT) scores attained by the 25 members of a local high school graduating class:
|
21
|
24
|
23
|
17
|
31
|
19
|
19
|
20
|
19
|
25
|
17
|
23
|
16
|
|
21
|
20
|
28
|
25
|
25
|
21
|
14
|
19
|
17
|
18
|
28
|
20
|
|
Find P99, P90, and P80 for the ACT scores. [Hint: Use nk/100 to find the location in the ordered data for each percentile.]