- (Topic 2)
Exhibit.

The variance of n numerical data x1, x2, x3, , , , , xn with the mean x is equal to
For the shares of stock purchased and then sold by the investors shown, the mean of the 5 numbers for Stock Y is 50 and the corresponding mean for Stock X is 70. The variance of the 5 numbers for Stock }' is what fraction of the corresponding variance for Stock X ?
A)

B)

C)

D)

E)

1. A. Option A
2. B. Option B
3. C. Option C
4. D. Option D
5. E. Option E

Correct Answer: E

- (Topic 3)
Typefaces, in one sense, are just like styles of shoes: they _____ because different people have different tastes and identities and because both creators and users value novelty for its own sake.

1. A. bemuse
2. B. converge
3. C. proliferate
4. D. abound
5. E. evolve
6. F. coincide

Correct Answer: CD

- (Topic 3)
Sunflower sea stars help maintain certain kelp forest ecosystems by eating quickly reproducing prey species such as urchins, thus keeping populations low. Without the sea stars, the urchin population explodes, which is bad news for kelp forests and everything in them. Gianl kelp can grow to 150 feet underwater at a speed of two feet a day. but their weaknesses are their holdfasts. which are akin to tree roots. The holdfasts are home to brittle stars, prawns, and snails, among other creatures. Urchins like to eat the kelp holdfasts. Once the holdfasts are gone, the rest of the kelp drifts oft* in the tides. In this way. urchins can destroy the forests, which, higher up. are also home (o fish, including several types of commercially important rockfish,
The passage compares kelp holdfasts to tree roots in order to

1. A. indicate the role of holdfasts in the acquisition of nutrients
2. B. emphasize the structural function of holdfasts
3. C. rationalize the use of the term "kelp forest"
4. D. point out similarities between terrestrial and aquatic flora
5. E. identify a misconception about kelp anatomy

Correct Answer: B

- (Topic 3)
Many people eschewed botany as merely the ______ business of renaming and reclassifying plants until the concern over Earth's loss of biodiversity brought botany into everyday discussions.

1. A. arcane
2. B. stodgy
3. C. enlightening
4. D. esoteric
5. E. essential
6. F. indispensable

Correct Answer: AD

- (Topic 2)

1. A. Quantity A is greater.
2. B. Quantity B is greater.
3. C. The two quantities are equal.
4. D. The relationship cannot be determined from the information given.

Correct Answer: D