Question 1
2 / 2 pts
(CO 4) Consider the following table:
Age Group Frequency
18-29 983
30-39 784
40-49 686
50-59 632
60-69 541
70 and over 527
If you created the probability distribution for these data, what w
...
Question 1
2 / 2 pts
(CO 4) Consider the following table:
Age Group Frequency
18-29 983
30-39 784
40-49 686
50-59 632
60-69 541
70 and over 527
If you created the probability distribution for these data, what would be the probability of 40-49?
0.237
0.425
0.189
Correct!
0.165
Question 2
2 / 2 pts
(CO 4) Consider the following table of hours worked by part-time employees. These employees must
work in 5 hour blocks.
Weekly hours worked Probability
5 0.06
15 0.61
20 0.18
25 0.15
Find the mean of this variable.
18.95
12.20
17.50
Correct!
16.80
Question 3
2 / 2 pts
(CO 4) Consider the following table:
Defects in batchProbability
0 0.21
1 0.19
2 0.30
3 0.15
4 0.11
5 0.04
Find the variance of this variable.
1.49
1.40
Correct!
1.97
1.88
Question 4
0 / 2 pts
(CO 4) Consider the following table:
Defects in batchProbability
0 0.04
1 0.11
2 0.25
3 0.20
4 0.19
5 0.21
Find the standard deviation of this variable.
1.41
3.02
Correct Answer
1.44
You Answered
2.08
text page 195
Question 5
2 / 2 pts
(CO 4) Twenty-two percent of US teens have heard of a fax machine. You randomly select 12 US teens.
Find the probability that the number of these selected teens that have heard of a fax machine is exactly
six (first answer listed below). Find the probability that the number is more than 8 (second answer listed
below).
Correct!
0.024, 0.000
0.993, 0.000
0.024, 0.001
0.993, 0.024
Question 6
0 / 2 pts
(CO 4) Ten rugby balls are randomly selected from the production line to see if their shape is correct.
Over time, the company has found that 89.4% of all their rugby balls have the correct shape. If exactly 7
of the 10 have the right shape, should the company stop the production line?
No, as the probability of seven having the correct shape is unusual
Correct Answer
No, as the probability of seven having the correct shape is not unusual
Yes, as the probability of seven having the correct shape is unusual
You Answered
Yes, as the probability of seven having the correct shape is not unusual
text pages 205-206
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