6. Roland received a score of 70 on a test for which the mean score was 65.5. Roland has learned that the z score for his test is 0.6. What is the standard deviation for this test scores?
6. Roland received a score of 70 on a test for which the mean score was 65.5. Roland has learned that the z score for his test is 0.6. What is the standard deviation for this test scores?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Transcribed Image Text:6. Roland received a score of 70 on a test for which the mean score
was 65.5. Roland has learned that the z score for his test is 0.6.
What is the standard deviation for this test scores?
7. Use the relative frequency distribution in table below to
determine the
a. Percent of subscribers who required less than 25 s to
download the file
b. Probability that a subscriber chosen at random will require
atleast 10 s but less than 30 s to downioad the file.
Download time
( in seconds)
Percent of subscribers
0-5
0.6
5-10
1.7
10-15
4.3
Sum is 15.2%
15-20
9.2
20-25
15.1
25-30
19.2
30-35
19.0
35-40
14.9
Sum is 69.1%
40-45
9.0
45-50
4.5
50-55
1.5
55-60
1.0
A vegotahlo
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