20. Exam Completion Time The mean time it tåkes a group of students to complete a statistics final exam is 44 minutes, and the standard deviation is 9 minutes. Within what limits would you expect approximately 95% of the students to complete the exam? Assume the variable is approximately normally distributed.

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Answer question #20 pls
20. Exam Completion Time The mean time it takes
a group of students to complete a statistics final
exam is 44 minutes, and the standard deviation is
9 minutes. Within what limits would you expect
approximately 95% of the students to complete the
exam? Assume the variable is approximately normally
distributed.
21. Cases of Meningitis The data show the number of spe-
cific recorded cases of meningitis for 14 specific states.
1 28 15 41 4 4 8 2 3
1
53 34 1
10
Source: Centers for Disease Control and Prevention
Find the z values for each
а. 10
b. 28
с. 41
SECTION 3-3
Sc
28
22. Exam Grades Which of these exam grades has a better
relative position?
a. A grade of 82 on a test with X = 85 and s = 6
b. A grade of 56 on a test with X = 60 ands 5
Be
23. The number of police calls a small police department
received each month is shown in the frequency
distribution.
Af
3-72
Transcribed Image Text:20. Exam Completion Time The mean time it takes a group of students to complete a statistics final exam is 44 minutes, and the standard deviation is 9 minutes. Within what limits would you expect approximately 95% of the students to complete the exam? Assume the variable is approximately normally distributed. 21. Cases of Meningitis The data show the number of spe- cific recorded cases of meningitis for 14 specific states. 1 28 15 41 4 4 8 2 3 1 53 34 1 10 Source: Centers for Disease Control and Prevention Find the z values for each а. 10 b. 28 с. 41 SECTION 3-3 Sc 28 22. Exam Grades Which of these exam grades has a better relative position? a. A grade of 82 on a test with X = 85 and s = 6 b. A grade of 56 on a test with X = 60 ands 5 Be 23. The number of police calls a small police department received each month is shown in the frequency distribution. Af 3-72
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