Chapter 3, Problem 35E

(a)

To determine

To find: the percent of total drivers are under 20.

Answer to Problem 35E

4.7%

Explanation of Solution

Given:

  

Calculation:

Total number of driver under age 20 = 93311640

Total number of driver = 200,665,267.

Therefore, the percent of total drivers under age 20 is

  $\frac{9,331,640}{200,665,267}\times 100=4.7\%$

Therefore, the percentage of total drivers under age 20 is 4.7%.

(b)

To determine

To find: the percent of total drivers are male.

Answer to Problem 35E

50%

Explanation of Solution

Given:

  

Calculation:

Total number of male drivers =100,389, 881

Total number of drivers =200,665,267.

Therefore the percentage of male drivers is

  $\frac{100,389,881}{200,665,267}\times 100=50.0\%$

Therefore, the percentage of male drivers is 50.0%.

(c)

To determine

To Explain: the few sentences comparing the number of female and male.

Explanation of Solution

Given:

  

Calculation:

Percentage of female and male licensed drivers in many age groups

Age	Male Driver (%)	Female Driver (%)
19 and under	51.2	48.8
20-24	50.6	49.4
25-29	50.6	49.4
30-34	50.7	49.3
35-39	50.7	49.3
40-44	50.3	49.7
45-49	50	50
50-54	49.9	50.1
55-59	49.9	50.1
60-64	49.8	50.2
65-69	49.6	50.4
70-74	49	51
75-79	47.5	52.5
80-84	46.2	53.8
85 and over	45.4	54.6

Graph:

  

By seeing the graph, it is noticed that there is all equal number of male and female drivers in age group but as the age is increasing number of female drivers is also increasing in comparison to male drivers.

(d)

To determine

To Explain: that the Driver’s age and Sex represent to be independent.

Explanation of Solution

By seeing the graph, it is noticed that there is all equal number of male and female drivers in age group but as the age is increasing number of female drivers is also increasing in comparison to male drivers. Therefore there is very easy association but a slight association between driver’s age and sex.