Posted by Shoab on Thursday, March 14, 2013 at 5:34am.
Approximately 50% of the eggs have lengths in the range 32 mm plus or minus ____________ mm

Math (incomplete)  PsyDAG, Friday, March 15, 2013 at 2:12pm
Assuming a normal distribution and 32 = mean, we still need to know SD.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.25) related to the Z score.