10 feet.
Equation: a = v1/3 = 1000 1/3 = 10ft.
Answer:
The point estimate for the proportion is p = 0.4725
The 95% confidence interval for the proportion of non-fatal accidents that involved the use of a cell phone is (0.4236, 0.5214).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of
, and a confidence level of
, we have the following confidence interval of proportions.

In which
z is the zscore that has a pvalue of
.
For this problem, we have that:

Point estimate

95% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:

The upper limit of this interval is:

The 95% confidence interval for the proportion of non-fatal accidents that involved the use of a cell phone is (0.4236, 0.5214).
4.

<u>n | 1 | 2 | 3 | 4 | 5 | 6 |</u>
f(n)| -20 | -17.5 | -15 |-12.5| -10 | -7.5 |
First term: -20 Common Difference: 2.5
Explicit Rule:
Recursive Rule: 
5.

<u>n | 1 | 2 | 3 | 4 | 5 | 6 |</u>
f(n)| 123 | 131 | 139 | 147 | 155 | 163 |
First term: 123 Common Difference: 8
Explicit Rule:
Recursive Rule: 