Wrong answers listed on DSST exam sheet??

[cboyle]

Hello all,

I'm scheduled to retake the DSST BusMath on Thursday, and I was going over the practice problems listed on the Fact Sheet for Business Math. I am almost positive that two of the questions/answers are incorrect, but I failed the test once so I know that math is not my forte!

Here are the two questions from the fact sheet.

4. Given five numbers, which of the statements
below is always true?
a. The arithmetic mean cannot be smaller than
the largest one of the numbers.
b. The arithmetic mean cannot be smaller than
the smallest two of the numbers.
c. The arithmetic mean cannot be smaller than
the median.
d. The arithmetic mean cannot be smaller than
three of the numbers.

The answer listed for problem 4 is b. But, what about the set of numbers: 1,4,4,4,5 ? The mean would be 3.6 which is smaller than the two smallest numbers. Could they have meant the median?



5. A jewelry store wants to sell five diamonds for
$1,200 per carat. If the weights of the diamonds
are 1/4, 5/6, 3/7, and ½ carats, what is their total
value?
a. $2,400
b. $2,750
c. $2,800
d. $2,814

The answer listed for problem 5 is d. My problem is that I only see the weights listed for 4 diamonds?

Maybe there are a few math geeks that could double check me? If the practice problems are incorrect, then how do I know that the test does not have incorrect problems too?

Thanks,

Caleb