SAT Mathematics Practice Test 4

Questions 30 and 31 refer to the following information.

A curator at a wildlife society created the scatterplot above to examine the relationship between the gestation period and life expectancy of 10 species of animals.

Question : 31 of 58

Marks: +1, -0

Of the labeled points, which represents the animal for which the ratio of life expectancy to gestation period is greatest?

Validate

Solution:

The ratio of life expectancy to gestation period for the animal represented by point A is approximately

{7\text"years"}/{23\text"days"}

or about 0.3 years/day, which is greater than the ratio for the animals represented by the other labeled points (the ratios for points B, C, and D, in units of years of life expectancy per day of gestation, are approximately

8/44,8/51,

and

10/51

respectively, each of which is less than 0.2 years/day).
Choices B, C, and D are incorrect and may be the result of errors in calculating the ratio or in reading the graph.

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