Q:1-Assume you have taken 100 samples of size 64 each from a population. The population variance is 49.
What is the standard deviation of each (and every) sample mean?
Mark one answer:
.875
.7
.35
.9

Q:6-Robert's work schedule for next week will be released today. Robert will work either 45, 40, 25, or 12 hours. The probabilities for each possibility are listed below:
45 hours: 0.3
40 hours: 0.2
25 hours: 0.4
12 hours: 0.1
What is the standard deviation of the possible outcomes?
Mark one answer:
35.8
32.7
11.07
13.5

Q:7-Robert's work schedule for next week will be released today. Robert will work either 45, 40, 25, or 12 hours. The probabilities for each possibility are listed below:
45 hours: 0.3
40 hours: 0.2
25 hours: 0.4
12 hours: 0.1
What is the mean outcome for the number of hours that Robert will work?
Mark one answer:
32.7
0.25
31.6
30.5

Q:8-What is the probability of getting a sum of 5,6,or7 when rolling two six-sided fair dice?
Mark one answer:
7/12
5/9
4/9
5/12

Q:9-Alex took a test in physics and scored a 35. The class average was 27 and the standard deviation was 5.
Noah took a chemistry test and scored an 82. The class average was 70 and the standard deviation was 8.
Show that Alex had the better performance by calculating -
1) Alex's standard normal percentile and
2) Noah's standard normal percentile
Mark one answer:
Alex = .923 ,, Noah = .911
Alex = .778 ,, Noah = .723
Alex = .945 ,, Noah = .933
Alex = .855 ,, Noah = .844

Q:10-Arrivals to a bed and breakfast follow a Poisson process. The expected number of arrivals each week is 4. What is the probability that there are exactly 3 arrivals over the course of one week?
Mark one answer:
12.4%
63.5%
19.5%
9.23%