permutations

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You have "250 metric tons"

How much will you be testing? 0.001% of 250 metric tons, no?
 
This question is confusing because I had another question that I was identical and I put 0.001% for the sample and it worked. Yet for this one it did not.
 
Microtech's quality assurance people test 0.001% of the 250 metric tons of coolant water at their plant for mercury each week. Any mercury found above the federal standard level will call for an immediate shutdown of operations.

Identify the population to be observed. answer- 250 metric tons of coolant water
Identify the sample. answer- 0.001%
Identify the variable to be measured. answer- I didn't know.
 
Ruby_Salamone said:
Microtech's quality assurance people test 0.001% of the 250 metric tons of coolant water at their plant for mercury each week. Any mercury found above the federal standard level will call for an immediate shutdown of operations.

Identify the population to be observed. answer- 250 metric tons of coolant water
Identify the sample. answer- 0.001%
Identify the variable to be measured. answer- I didn't know.
Click to expand...
You're not paying attention.

How much will you be testing? 0.001% * 250 metric tons = ?
 
I think this kind of question is a little unfair in this context (a computer judging the answer), because you could say a number of different things and be considered right. The sample is simply the water that is tested. They could want the percentage, or they could want the number of tons; and it could be that your "error" is just to omit words, e.g. "0.001% of the coolant water". But I would certainly try tkhunny's answer before giving up. Just be sure to include the unit you use, "___ metric tons of coolant water".

Sometimes when I see a question like this, I look for a similar example from the same source, to see how they state it. In a textbook, that would mean looking for the answer to a similar problem in the back of the book, or in the chapter proper. But you say it did accept a percentage in a similar problem; how about showing us the wording of that problem, so we can see if there is some subtle difference in working we could point out.

Or, you could ask your teacher about it.
 
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