Author Question: According to an industry report, 26 percent of all households have at least one cell phone. Further, ... (Read 55 times)

go.lag · **on:** Jun 24, 2018

According to an industry report, 26 percent of all households have at least one cell phone. Further, of those that do have a cell phone, the mean monthly bill is 55.90 with a standard deviation equal to 9.60.

Recently, a random sample of 400 households was selected. Of these households, 88 indicated that they had cell phones. The mean bill for these 88 households was 57.00. What is the probability of getting 88 or fewer households with cell phones if the numbers provided by the industry report are correct?A) Approximately 0.0344
B) Nearly 0.4656
C) About 0.1345
D) Can't be determined without knowing the standard deviation

Question 2

The Fitness Center manager has collected data on the number of visits to the club each week for the past 8 weeks. These data are shown as follows. Which of the following statements is most correct?

Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8
1415 1623 1934 1879 2102 2156 2511 2499

A) The proper graph for displaying these data is a pie chart.
B) There has been a gradual downward trend in these data.
C) A frequency histogram should be developed to help identify the trend in these data.
D) The data lend themselves to a line chart.