In Exercises $9$ and $10,$ find the maximum error of estimate for $.$

$9.c=0\mathrm{.}90,s=23\mathrm{.}4,n=16,\stackrel{}{x}=52\mathrm{.}8$

$10.c=0\mathrm{.}95,s=0\mathrm{.}05,n=25,\stackrel{}{x}=3\mathrm{.}5$