Problem $1$

Three standard mortar cubes were made using non$-$potable water available at the job site, and three others were made using potable water. The cubes were tested for compressive strength after seven days of curing and produced the following failure loads in $kg$ :

$\backslash$table$[[\backslash$table$[[$Non$-$potable water$],[$Failure load $[$kg$]]],\backslash$table$[[$Potable water$],[$Failure load $[$kg$]]]],[6,598,7,773],[6,285,7,400],[7,058,7,364]]$

Based on these results only, would you accept that water for mixing concrete according to ASTM standards? Explain why.