. A company has four locations at which customers were surveyed for their satisfaction ratings. The table below lists the average customer rating for each of the four locations and the number of customers that responded to the survey at that location. i)Calculate the total average customer rating for the company. Location Average Rating Number of Customers 1 7.8 117 2 8.5 86 3 6.6 68 4 7.4 90
Q1. A company has four locations at which customers were surveyed for their
satisfaction ratings. The table below lists the average customer rating for each of
the four locations and the number of customers that responded to the survey at
that location.
i)Calculate the total average customer rating for the company.
|
Location |
Average Rating |
Number of Customers |
|
1 |
7.8 |
117 |
|
2 |
8.5 |
86 |
|
3 |
6.6 |
68 |
|
4 |
7.4 |
90 |
ii). The following table shows the relative frequency of executive salaries a
particular organization.
|
Event |
Salary Range |
Relative Frequency |
|
A |
Under k60,000 |
0.09 |
|
B |
K60,000-under k70,000 |
0.21 |
|
C |
K70,000-under k80,000 |
0.28 |
|
D |
K80,000-under K90,000 |
0.15 |
|
E |
K90,000- under K100,000 |
0.23 |
|
F |
K100,000 or more |
0.04 |
|
Total |
1.00 |
(a) Determine the probability that a randomly selected executive has a salary
greater than or equal to k70,000 but less than k100,000.
(b) Determine the probability that a randomly selected executive has a salary
that is either less than k60,000 or greater than or equal to k90,000.
(c) Are the events A through F mutually exclusive?
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