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The figure above shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.

The lengths of phone calls made on a certain weekend by students at High School H are approximately normally distributed with a mean of 30 minutes and a standard deviation of 10 minutes. Which of the following statements must be true?

Indicate all such statements.
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?
If an integer is chosen at random from the integers between 101 and 550, inclusive, what is the probability that the chosen integer will begin with the digit 1, 2 or 3, and end with the digit 4, 5, or 6?
$$n$$ is an even integer greater than $$2$$.

Quantity A

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

Quantity B

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


Recent advances in the study of desert varnish have been a boon to geologists, allowing them to date surface features and establish regional histories in ___________ detail.
Behavioral economists point to _____________ as one reason that people do not always make choices that promote their own welfare; sometimes people simply fail to take steps that they know to be in their own best interest.
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.
The obsidian found across the Pungaere-Upokorau area in New Zealand has previously been thought to come from two distinct sites (Pungaere and Waiare), but considering that the visual characteristics and chemical composition of the obsidian in the area are so (i) _____________, there is no reason to continue regarding Waiare as (ii) _____________ source, especially in view of the fact that finds of obsidian near Waiare settlement and in the Waiare Stream are (iii) _____________.
The bird-watchers' ________________ distinguishing personal interpretations from factual observations was a liability in their stated goal of obtaining objective information about the everyday behavior of ravens.
The myth of the scientific method as a neat progression from hypothesis to experiment to conclusion is dispelled once you enter a lab and observe the _____________ process by which researchers actually make discoveries.
After the first monarch butterfly overwintering site was discovered in Mexico in 1975, the biologist Lincoln Brower (i) _____________ the (ii) _____________ of additional sites. The principal reason for Brower's contention was that roosting in a very limited area would make the species highly vulnerable to wildfire.
For many in the room, the idea of coming to the assistance of a rival was more than unpleasant: it was _____________.
Although streams of solar particles cause beautiful auroras-the northern and southern lights—sometimes their consequences are less _____________: their electromagnetic effects, for instance, can overload power grids and damage orbiting satellites.
Although many parents tend to be extremely critical of the public school educational system as a whole, they are reluctant to treat their children's teachers with equal _____________.
Science is a seemingly inexhaustible source of _____________, yet paradoxically scientists have been portrayed in recent decades as rather conservative—resisting innovation in their discipline sometimes to the point of dogmatism.
Whereas the original editor had sacrificed clarity for brevity and her successor had been too _____________, the new editor took an intermediate approach, explicit as to the purport of each document and not too ambitious in detail.
Prose (i)________ the notion that, as a patron of the arts, Peggy Guggenheim was (ii)________; Guggenheim, Prose argues, simply had limited funds to bestow on the many artists and writers who depended on her.
Tender yet never ________, the memoir engages the reader without resorting to cliches.
We wallow in bad news, tales of how things went wrong, but we have only the most _____________ discussions regarding how they might go right.
As theories, quantum field theory and theory of general relatively have been astonishingly (i) _____________, in that no experiment yet has shown a crack in either of them, even though both of them (ii) _____________ wildly counterintuitive properties in physical reality. And yet even proponents note that the two theories are (iii) _____________, a fact that has disallowed theorists—at least so far—from incorporating both into a self-consistent theory of quantum gravity.

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