Posted by ellas on Saturday, March 2, 2013 at 1:34pm.
A distribution of weights is symmetric about its median. The lower quartile of the weights is 90 pounds and the median is 120 pounds. Find the interquartile range of the distribution.

statstics  Dr. Jane, Saturday, March 2, 2013 at 3:17pm
If weights are symmetric about the median then is you have 90 lbs at the lower quartile, you should have 150 at the upper quartile.
Subtract the two numbers to get the interquartile range. 
statstics  ellas, Sunday, March 3, 2013 at 3:20am
i did't get it even i got the wright answer , how do u calculated upper quartile ?? on hit and trial basis??

statstics  PsyDAG, Sunday, March 3, 2013 at 1:44pm
The upper quartile is the 75th percentile.

statstics  Anonymous, Wednesday, March 6, 2013 at 3:01am
150