Mathematics
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DA6
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1. Lesley's results in her Trial HSC are shown
| Subject | Mean | S.D. | Lesley |
|---|---|---|---|
| English |
55
|
8
|
71
|
| Food Technology |
50
|
9
|
70
|
| Music |
65
|
10
|
60
|
In
which subject did Lesley score her best result.
2. A
normal distribution of scores has a mean of 55 and a standard deviation
of 7.
What percentage of the scores lies between 41 and 69?
3. A
set of scores has a mean of 45 and a standard deviation of 6.
Which mark corresponds to a z-score of –2?
4. A
set of scores has a mean of 60 and a standard deviation of 12.
Which z-score corresponds to a score of 84?
5. A set of scores has a mean of 70 and a standard deviation of 9. Within what limits will the scores almost certainly lie.
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