Question

schools the information below represents the fall enrollment of students (in millions) in grades k - 8 for public and private schools.

year	1980	1985	1990	1995
private school	4.0	4.2	4.1	4.4

in exercises 7 and 8, decide whether each statement is true or false based on the table.

1. the ratio of public to private enrollment has decreased overall from 1980 through 1995.
2. the total number of students has increased.
3. construct a bar graph of the combined enrollment for public and private schools.

business the table represents a company’s revenue and expenses (in thousands of dollars) for six months.

month	july	aug.	sept.	oct.	nov.	dec.		----	----	----	----	----	----	----
revenue	48	39	36	42	57	62
expenses	38	58	54	48	37	51

1. in what month were the expenses the greatest?
2. profit is the difference of revenue and expenses. what was the company’s profit in november?
3. construct a line graph of the company’s revenue.
4. was it a profitable six months for the company? explain.

life expectancy in exercises 14 and 15, use the information in the table, which gives the life expectancy in the united states for a child (at birth).

year	1930	1940	1950	1960	1970	1980	1990	2000

1. in which decade did life expectancy increase the most?
2. construct a line graph of these data and discuss what the line graph shows.

Explanation:

7.

Step1: Calculate ratio in 1980

In 1980, ratio of public to private enrollment is $\frac{27.6}{4.0}=6.9$.

Step2: Calculate ratio in 1995

In 1995, ratio of public to private enrollment is $\frac{32.4}{4.4}\approx7.36$.

Step3: Compare ratios

Since $7.36>6.9$, the ratio has increased. So the statement is false.

Step1: Calculate total enrollment in 1980

In 1980, total enrollment is $27.6 + 4.0=31.6$ (in millions).

Step2: Calculate total enrollment in 1995

In 1995, total enrollment is $32.4+4.4 = 36.8$ (in millions).

Step3: Compare totals

Since $36.8>31.6$, the total number of students has increased. So the statement is true.

Step1: List expenses values

Expenses values are 38, 58, 54, 48, 37, 51 for July - Dec respectively.

Step2: Find maximum value

The maximum value among these is 58 which corresponds to August.

Answer:

False

8.