Match the function to its purpose.
median
rank
standard deviation
mode
you can see how far each number
varies, on average, from the average
value of the list.
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calculates the average of the two
numbers in the middle of a set of
even count of numbers.
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this function shows the most frequently
occurring number in a set of numbers.
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with this function, you can determine
the position of a number in an
unarranged array or set.
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Median :Calculates the average of the two  numbers in the middle of a set of even count of numbers.Mode : This function shows the most frequently  occurring number in a set of numbersStandard deviation : You can see how far each number  varies, on average, from the average  value of the listRank : With this function, you can determine  the position of a number in an  unarranged array or set.

Explanation:

Answer domain name system (dns);

For question 1, i'm a bit stuck between serif fonts or large enough type to read. serif fonts are good fonts to use because their easy to read. but you also need your type be large enough to read. if i had to say what you need to consider most important, i would say d is the answer.  for question 3, i believe the answer is d. it seems most appropriate to do that. on every page or every other page would be too much, and only on the contact page just seems inappropriate.  for question 4, it's probably a. by "color scheme" it doesn't mean just one color, but a set of colors. colors that are complimentary to each other. having too many is too distracting so it's best to limit it as much as possible, but not to the point where your website looks dull.hope this !