Answer:
(a)Attached
(b)69 degrees
(b)The ladder is safe
Step-by-step explanation:
(a)See attached diagram
The wall is length |AB| and the ladder is length |AC|
(b)
(c)Jamie wants the angle of the ladder makes with the ground to be no greater than 75 degrees for safety reasons.
Since the angle formed between the ground and the ladder (69 degrees) is less than 75 degrees, the ladder is safe the way it is positioned.
Answer:
Option d.
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 .
The margin of error is:
79 percent of adults age 18 years and older in the United States use the Internet.
This means that
98% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Which of the following should be used to find the sample size (n) needed?
We have to find n for which
So the equation is:
Option d.