Many companies are increasingly concerned about computer security and employees using their computers for personal use. a random sample of 50 employees of liberty mutual insurance company was asked whether they use the internet for nonbusiness (personal) purposes during the day. the number of hours for each employee is given on the text website. assume sigma = 0.5 hours. a. find a 95% confidence interval for the mean number of hours all employees at liberty mutual use the internet for personal reasons. b using the confidence interval in part (a), is there any evidence to suggest that the mean time spent using the internet for personal reasons is more than 1 our justify your answer. c. how large a sample is necessary for the bound on the error of estimation to be 0.1 hours? d. do you think the underlying distribution of time spent on internet for personal use is normal? explain your answer.

the range of a function is the range of y-values for which it is defined, or exists. given that we are only looking at the y-values, we can already discount the first two answers as they deal with the domain of the function (range of x-values).

now, what we need to do is find the smallest and highest y-values for which the function is defined. if you'd like, you could take a ruler and start at the very bottom of the graph, find the lowest point, then move the ruler higher and higher until you reach the highest point. doing so either in your head or with an actual ruler, we can see that the lowest y-value is -5 and the highest y-value is -1.

the question now remains as to whether they are included in the range (fourth answer) or excluded (third answer). the key here is to recognise whether they are marked with an open or a closed circle. since both (-2, -5) and (2, -1) are marked with a closed circle, they are points that exist on the graph and are thus included in the range (note that if they were marked with an open circle like (4, -2) then that would signify that there is a break in the graph at that point).

thus, the fourth answer, (y | -5 ≤ y ≤ -1), is correct.

also note that usually it is good practice to scan your eye inbetween the highest and lowest point for any breaks in the graph - we do have one here at (4, -2), however -2 is still included in the range because there is another point that is included in the graph with the same y-value, ie. point (1, -2).

i hope that but if you require any further explanation don't hesitate to comment below.

figure c

step-by-step explanation:

hope this .

120 seems like the most sensible answer.

step-by-step explanation:

if there is only one topping on all caramel apples and there's 120 of them. then all apples should/will be covered in sprinkles. make sense?