college math
posted by dannie0913 .
3.15 A bank branch located in a commercial district of a city has developed an improved process for A bank branch located in a commercial district of a city has developed an improved process for serving customers during the noonto1:00 p.m. lunch period. 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 contained in the data file Bank1 and are listed below:
Waiting Time
4.21
5.55
3.02
5.13
4.77
2.34
3.54
3.2
4.5
6.1
0.38
5.12
6.46
6.19
3.79
a. Compute the mean and median.
b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain.
c. Are the data skewed? If so, how?
"d. As a customer walks into the branch office during the lunch hour, she asks the branch manager how long she can expect to wait. The branch manager replies, “Almost
certainly less than five minutes.” On the basis of the results of (a) through (c), evaluate the accuracy of this statement."

Assuming the values are all in seconds, all the values are less than 5 minutes (300 seconds).
Median = point at which half the scores are below and half above.
The mean = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
Range = highest score  lowest
Z = (scoremean)/SD
I'll let you do the calculations. 
I goofed. Now I see that the values are probably minutes and decimal portions of minutes. This invalidates my first statement…ONLY.
Respond to this Question
Similar Questions

Stats
A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noonto1 p.m. lunch period. The waiting time (operationally defined as the time elapsed from when the … 
PreCalculus
. Margaret is planning to invest up to $22,000 in certificates of deposit at City Bank and People’s Bank. She wants to invest at least $2,000 but no more than $14,000 at City Bank. People’s Bank does not insure more than … 
math
A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon to 1.00 pm lunch period. The waiting time (defined as the time elapsed from when the customer enters … 
Math
Jamaal is planning to invest up to $23000 in City Bank or State Bank. He wants to invest at least $4000 in City Bank, but not more than $16000; since State Bank does not insure more than $8000, he wants to invest no more than this … 
physics
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree at an angle of 33° above the horizontal. One child, with a mass of 51 kg, is 1.4 m along the branch from the tree trunk. … 
physics
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree at an angle of 26° above the horizontal. One child, with a mass of 38 kg, is 1.1 m along the branch from the tree trunk. … 
physics
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree at an angle of 26° above the horizontal. One child, with a mass of 38 kg, is 1.1 m along the branch from the tree trunk. … 
physics
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree at an angle of 23° above the horizontal. One child, with a mass of 59 kg, is 1.8 m along the branch from the tree trunk. … 
geometry
on a town map ,each unit of the coordinate plane represents a mile. Three branches of a bank are located at A(3,1) , and C (4,1). A bank employee drives from branch A to branch B and then drives halfway to branch C before getting … 
Math
There are five Voting Districts in the City; District A with 877 constituents, District B with 1062 constituents, District C with 1364 constituents, District D with 1518 constituents, and District E with 1933 constituents. There are …