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January 25, 2015

January 25, 2015

Posted by **Jen** on Saturday, July 30, 2011 at 2:55pm.

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 3:32pmmean: 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 3:58pmthe 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 4:53pmRight! :-)

- Math -
**Jen**, Saturday, July 30, 2011 at 5:13pmyay!! 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 - Math -
**Jen**, Sunday, July 31, 2011 at 9:36amThe 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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