Posted by Jen on .
The number of dry cleaning orders picked up at Sunny Fresh Dry Cleaners was sampled over 12 hour periods. Below is the sample:
142 171 125 91 140 125 97 125 162 142 125 117 89 125 140 128
From this data set, compute the sample mean, median, mode and midrange. Compute the 1st
quartile and 3rd and interpret their meanings.
I'm pretty sure i did this part correct, but im confused with the second part....
mean: 2044/127.75
median: 8 + 9 = 17/2 = 8.5
mode: 125
Range: 73??

Math 
Ms. Sue,
mean: You added correctly, but did not divide by the total number of numbers.
http://www.mathgoodies.com/lessons/vol8/mean.html
median. Certainly 8.5 cannot be the median.
http://www.mathgoodies.com/lessons/vol8/median.html
mode: correct
range: wrong
http://www.mathgoodies.com/lessons/vol8/range.html 
Math 
Jen,
the mean is 2044/16 = 127.75
the median is 125 + 125 = 250/2 = 125
the range is 171  89 = 82
Am i correct? 
Math 
Ms. Sue,
Right! :)

Math 
Jen,
yay!! thanks!! but what about the second part:
Compute the 1st
quartile and 3rd and interpret their meanings.
?? im confused  Math  Ms. Sue,

Math 
Jen,
The 1st quartile (lower quartile) is 34 and the 3rd quartile (upper quartile) is 61. The lower quartile is the middle value of the lower half. The upper quartile is the middle value of the upper half.
is that correct??