An item costs $410 before tax, and the sales tax is $20.50 . find the sales tax rate. write your answer as a percentage.
2 answers:
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1) A. Biased because the population could be uneven. Too many of one ethnicity, too many of one gender, etc.
2) I believe this one is C. because there are not enough people. You need to survey the majority of parents instead of a selected few.
3) There are 80 green marbles per 500, therefore calculate the percentage.
or 
percent. Multiply percent or 
times 25. It gives you 
.
4) This one is a probability thing too. For every 500 batteries, there are 3 that are defective, therefore,
.
5) Yet another one. Add up all the nuts and you get
. The chance of getting a cashew from these is: 
.
Therefore:
2) I believe this one is C. because there are not enough people. You need to survey the majority of parents instead of a selected few.
3) There are 80 green marbles per 500, therefore calculate the percentage.
4) This one is a probability thing too. For every 500 batteries, there are 3 that are defective, therefore,
5) Yet another one. Add up all the nuts and you get
Therefore:
Density 
is given by the equation
