1. A bank branch located in a residential area is concerned with the noon-to-1:00 p.m. Iunch hour. The waiting time, in minutes (defined as the time the customer enters the line to when he or she reaches the teller window), of a sample of 15 customers during this hour is recorded over a period of one week. The results are listed below: 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47 a. Compute the mean, median, and mode. b. As a customer walks into the branch office during the lunch hour, he asks the branch manager how long he can expect to wait. The branch manager replies, “Almost certainly less than five minutes." On the basis of the results in (a), evaluate the accuracy of this statement. 2. The mean score in statistics of 50 students in a class was 72 and that of the 35 boys was 75. Find the mean score of the girls in the class. 3. The mean of 200 items was found to be 50. Later on it was discovered that two items were wrongly read as 92 and 8 instead of the correct values 192 and 88 respectively. Find the correct mean.
1. A bank branch located in a residential area is concerned with the noon-to-1:00 p.m. Iunch hour. The waiting time, in minutes (defined as the time the customer enters the line to when he or she reaches the teller window), of a sample of 15 customers during this hour is recorded over a period of one week. The results are listed below: 9.66 5.90 8.02 5.79 8.73 3.82 8.01 8.35 10.49 6.68 5.64 4.08 6.17 9.91 5.47 a. Compute the mean, median, and mode. b. As a customer walks into the branch office during the lunch hour, he asks the branch manager how long he can expect to wait. The branch manager replies, “Almost certainly less than five minutes." On the basis of the results in (a), evaluate the accuracy of this statement. 2. The mean score in statistics of 50 students in a class was 72 and that of the 35 boys was 75. Find the mean score of the girls in the class. 3. The mean of 200 items was found to be 50. Later on it was discovered that two items were wrongly read as 92 and 8 instead of the correct values 192 and 88 respectively. Find the correct mean.
Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter11: Data Analysis And Displays
Section11.4: Two-ways Tables
Problem 5E
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Transcribed Image Text:Answers:
1. a. X= 7.11, Median = 6.68, Mode = No mode
b. The mean waiting time is more than 5 minutes. The manager overstated the bank's service record
in responding that the customer would “almost certainly" not wait longer than 5 minutes for
service.
2. īg = 65.
3.
x = 50.9
Transcribed Image Text:1. A bank branch located in a residential area is concerned with the noon-to-1:00 p.m. lunch hour.
The waiting time, in minutes (defined as the time the customer enters the line to when he or she
reaches the teller window), of a sample of 15 customers during this hour is recorded over a period
of one week. The results are listed below:
9.66
5.90
8.02
5.79
8.73
3.82
8.01
8.35
10.49
6.68
5.64
4.08
6.17
9.91
5.47
a. Compute the mean, median, and mode.
b. As a customer walks into the branch office during the lunch hour, he asks the branch manager
how long he can expect to wait. The branch manager replies, “Almost certainly less than five
minutes." On the basis of the results in (a), evaluate the accuracy of this statement.
2. The mean score in statistics of 50 students in a class was 72 and that of the 35 boys was 75. Find
the mean score of the girls in the class.
3. The mean of 200 items was found to be 50. Later on it was discovered that two items were wrongly
read as 92 and 8 instead of the correct values 192 and 88 respectively. Find the correct mean.
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