Answer:
0
Step-by-step explanation:
Answer:
9.0625%
Step-by-step explanation:
It increased from 320 to 349
This is a percent INCREASE.
320 is the "old" value and 349 is the "new" value.
We find percent increase by the formula:

Where old is 320 and new is 349. Lets substitute and find the increase (percentage):

The percentage increase is 9.0625%
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Answer: B. This student's test grade was 2.4 standard deviations above the mean test grade.
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Explanation:
The z score tells us how far away the raw score is from the mean. This distance is in terms of standard deviations.
- z = 1 means we're 1 standard deviation above the mean
- z = 2 means we're 2 standard deviations above the mean
and so on.
Negative z scores indicate the raw score is below the mean.
- z = -1 means we're 1 standard deviation below the mean
- z = -2 means we're 2 standard deviations below the mean
and so on. So that's why z = 2.4 indicates the students test grade was 2.4 standard deviations above the mean.