# 12 based on the description of the water sample

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12.Based on the description of the water sample analysis in question 11, the solids that were determined in question11 and reported in the above table area) dissolved solidsb) suspended solidsc) total solids13.Calculate the standard deviation for the mass of solids per mass of water sample in the table you filled out inquestion 11.Show calculations on the worksheet provided at the end of this quiz.Standard Deviation =_7.70 x 10-4g/g_____________14.Calculate the percent relative standard deviation for the mass of solids per mass of water sample in the table youfilled out in question 11.Show calculations on the worksheet provided at the end of this quiz.Percent Relative Standard Deviation =0.630%______________
HELPFUL FORMULASIn the following formulas, the x variables are the measured values, and i is an index.The variable nrefers to the total number of measurements made.For example, if you make 3 measurements, n=3and the index i can take on the values 1, 2, and 3.That is, you will have variables x1, x2, and x3.Thesymbol ∑ means to add values.Often, the lower and upper limits of the index that should be includedin the addition are appended to the ∑ symbol.Normally, you add up all of the measured values – thatis taking the index from 1 to its upper limit n.
WORKSHEETX1=0.1230X2=0.1213X3=0.1221X4=0.1228d1=X1´X=0.12300.1223= 0.0007d12=(0.0007)2=4.9×107d2=X2´X=0.12130.1223=−0.0010d22=(0.0010)2=1×106d3=X3´X=0.12210.1223=−0.0002d32=(0.0002)2=4×108d4=X4´X=0.12280.1223=0.0005d42=(0.0005)2=2.5×1074.9×107+1×106+4×108+2.5×1073¿1.78×1063=5.9´3×107=7.70×104100×7.70×1040.1223=0.630
WORKSHEET
WORKSHEET
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Term
Fall
Professor
Seare Berhe
Tags
Ion