Selected
Answer:
77.3
Correct Answer:
77.3
Question 7
3 out of 3 points
Solve the problem.
The maximum value of a distribution is 14.4 and the minimum value is 4.9. Use the
range rule of thumb to find the standard deviation. Round results to the nearest tenth.
Selected
Answer:
2.4
Correct Answer:
2.4
Question 8
3 out of 3 points
Use the empirical rule to solve the problem.
At one college, GPA's are normally distributed with a mean of 2.7 and a standard
deviation of 0.5. What percentage of students at the college have a GPA between 2.2
and 3.2?
Selected
Answer:
68%
Correct Answer:
68%
Question 9
3 out of 3 points
Answer the question, considering an event to be "unusual" if its probability is
less than or equal to 0.05.
Is it "unusual" to get 9 when a pair of dice is rolled?
Selected
Answer:
No
Correct Answer:
No
Question 10
3 out of 3 points
Estimate the probability of the event.
A polling firm, hired to estimate the likelihood of the passage of an up-coming
referendum, obtained the set of survey responses to make its estimate. The
encoding system for the data is:
If the referendum were
held today, estimate the probability that it would pass.
0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0