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At Site II, if the average (arithmetic mean) salaries in production, administration, and research are $$x$$, $$y$$, and $$z$$ dollars, respectively, what is the average salary, in dollars, of all employees at Site II?

Quantity A

The standard deviation of the heights of 12 children whose mean height is 50 inches

Quantity B

The standard deviation of the heights of 10 children whose mean height is 60 inches


The sum of the first n positive integers can be found using the formula $$\frac{n(n+1)}{2}$$.

The sum of the first n positive odd integers can be found using the formula $$(\frac{s}{2})^2$$, where s is the sum of the first and last odd integer.

If $$x$$ is equal to the sum of the integers from 1 to 100, and if $$y$$ is equal to $$\frac{1}{2}$$ of the sum of the odd integers from 1 to 199, what is the value of $$x-y$$?
During a 7-day period, a plant's height increased half as much each day as it did the day before. What is the ratio of the plant's increase in height on day 4 to its increase in height on day 7?
$$n$$ is an even integer greater than $$2$$.

Quantity A

$$\frac{n!}{(\frac{n}{2})!}$$

Quantity B

2($$\frac{n}{2}$$)!


_______________ though individual mosquitoes appear, historically they have shown an impressive ability to travel, sometimes at stowaways in water casks and drinking vessels on ships travelling to distant continents.
Many types of rocks contain small voids that ___________ vibrations: the greater proportion of a rock's volume that is void, the more gradually vibrations travel through it.
Because leadership in the computer hacker group is extremely (i)________, when law enforcement agencies arrested several prominent members, taking them offline, the group (ii)_______. Instead, it continues to operate, sometimes under its own name, sometimes under other names. The names are (iii)________, as are the members of the group: anyone, anywhere, is free to work behind its mask.
Because it has usually been impossible to eradicate exotic species once they have become established, it is ____________ to minimize introductions of species that have substantial probabilities of unwanted impacts.
The sound of disembodied human breathing in Miyazaki`s films is at once a presence, close to the listener`s ear, and a ghostly absence due to its lack of a visual __________.
Monarch butterflies sequester toxins in their skin to discourage predators, but black-backed orioles (Icterus abeillei) ___________ the defense: they consume only the soft insides of the butterfly.
Issues associated with intermittent availability of wind and sunlight as forms of renewable energy are not ____________, as shown by recent advances in energy conversion and storage.
Responsibility for the nation's decline rests squarely with a people who take for granted their claims to preeminence but do not ____________ interest in or commitment to actually maintaining it.
The (i) _____________ seen in most of eastern Eurasia is (ii) _____________ on the Mongolian plateau, despite only 200 millimeters of annual precipitation, because evaporation decreases at higher altitudes and latitudes.
By using (i) _____________ prose throughout, the contributors to this anthology have been able to make their subject seem (ii) _____________ in the extreme—of concern only to one another.
Advertising's role in popular music culture has been redefined: instead of a last resort for the creation and distribution of popular music, advertising now functions as a ___________ of music that might otherwise go unheard.
While Hassler's trademark (i)____________ is sometimes useful in (ii)____________ an institution entrenched in complacency into changing its ways, such brusqueness is more often counterproductive, tending to (iii)____________ people.
For certain economies, “pure” economic theory, that is, economic theory ____________ a specific social structure, is impossible, much like a concept of anatomy that investigates no specific species.
There's ______________ throughout the Broadway adaptation of The Color Purple that, while hardly true to the harrowing bleakness of the early chapters of Alice Walker's novel, does bring to mind the enjoyable hokey cinematic lavishness of the film version.
Materials expand and contract with temperature changes. This general concept has been exploited for thousands of years, for instance, to ensure tight rivets in blacksmithing by shrink-fitting. For precision instruments, however, (i) _____________ materials are truly (ii) _____________ : hence the importance of Invar, an alloy notable for its (iii) _____________ expansion and contraction over a range of temperatures.

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