x(2)=89
x(3)=76
x(4)=65
x(5)=88
x(6)=72
x(7)=85
x(8)=81
x(9)=90
x(10)=56
sumx=0
for i=1 to 10
sumx=sumx+x(i)
endfor
avex=sumx/10
sumx2=0for i=1 to 10
sumx2=sumx2+(x(i)-avex)^2
s=sqrt(sumx2/10)?s