Homework Help: Math

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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