Solve for x. 0.5x+78.2=287
1 answer:
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Answer:
Cutoff for a failing score is 49 and 2.28% students failed.
Step-by-step explanation:
We have been given that scores on a psychology exam were normally distributed with a mean of 57 and a standard deviation of 4.
2 standard deviation below mean would be,
Therefore,Cutoff far a failing score is 49.
Now let us find out the z-score for our given values,
Now let us look up the probability from normal distribution table.
Therefore, percentage of students failed is 2.28%.
The best way I can explain the graph is:
1. look at the line and mark a point where ever you see the line goes through a point (look at picture bellow)
2. best example on your graph is (40, 20): April 40...March 20
3. you will notice that march will always sell half the number of april's sale
another example in your graph:
april sold 10....the line seem to be a 10, 5.....march sold 5
1. look at the line and mark a point where ever you see the line goes through a point (look at picture bellow)
2. best example on your graph is (40, 20): April 40...March 20
3. you will notice that march will always sell half the number of april's sale
another example in your graph:
april sold 10....the line seem to be a 10, 5.....march sold 5