Posted by Jen on Saturday, July 30, 2011 at 2:55pm.
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, Saturday, July 30, 2011 at 3:32pm
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, Saturday, July 30, 2011 at 3:58pm
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, Saturday, July 30, 2011 at 4:53pm
Right! :)

Math  Jen, Saturday, July 30, 2011 at 5:13pm
yay!! thanks!! but what about the second part:
Compute the 1st
quartile and 3rd and interpret their meanings.
?? im confused

Math  Ms. Sue, Saturday, July 30, 2011 at 5:35pm
http://www.onlinemathlearning.com/quartile.html

Math  Jen, Sunday, July 31, 2011 at 9:36am
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??
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