Question 869872
{{{mu=(52(2)+57(4)+62(5)+67(10)+72(9 )+77(5))/(2+4+5+10+9+5)}}}
{{{mu=67}}}
{{{V=((52-67)^2(2)+(57-67)^2(4)+(62-67)^2(5)+(67-67)^2(10)+(72-67)^2(9 )+(77-67)^2(5))/(2+4+5+10+9+5)}}}
{{{V=48.57143}}}
{{{sigma=sqrt(V)}}}
{{{sigma=6.969}}}