The weekly price fluctuation of WMB stock has a mean of $3.01 and a standard deviation of $0.31. A sample of 149 weekly price fluctuations for this stock have been measured and the mean has been calculated. Calculate the standard error of the mean (σX). Give your answer to 3 decimal places.

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.