Can you please check over!

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Sue20

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What is the probability that the SAT test taker chosen at random scores 480 on the Math section? ( Any raw score between 475 and 485 is reported as 480.) Use mean= 500 and a std. dev.= 100. (express as a decimal rounded to 4 decimal places)
Here is my work:
normalcdf= (100,480,500,100)= .4207
=42.1 (Is this the correct answer?)
 
What is the probability that the SAT test taker chosen at random scores 480 on the Math section? ( Any raw score between 475 and 485 is reported as 480.) Use mean= 500 and a std. dev.= 100. (express as a decimal rounded to 4 decimal places)
Here is my work:
normalcdf= (100,480,500,100)= .4207
=42.1 (Is this the correct answer?)

Once again, we must think about our answer and ask ourselves if it makes sense. Do you think that 42% of all the people who take the SAT all score 480? (No.)

What is the meaning of the 42% number that you calculated (i.e., what does "cdf" *mean*)? How is that different from what you're being asked?

How can we use the information that "Any raw score between 475 and 485 is reported as 480."?
 
Two things:

1) The problem statement uses (475,485). Where is this reflected in your input parameters?
2) "normalcdf(100,480,500,100)" -- You had better check all these inputs. It appears you have forgotten how to include the proper values.

Is it normalcdf(mean, standard deviation, left limit, right limit)? If so, that would be (500,100,475,485)
 
Can you please check over?

So would you put the numbers in that order for normalcdf? If so why?
 
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