sample variance and standard deviatian

Hi, I'm supposed to find the sample variance and standard deviation for a problem with 30 values (the height of each family member calculated by inches). I have to show the work so i cannot just use a calculator (when I use the calculator i am incorrect) could someone please check my work, I don't know if i'm suppose to round up the mean?? or just what i'm doing wrong..here is the data...thanks
(individual data) subtract from ( mean) 64.36 then I hit 'x2' on my calc for 3rd column??
____________________________ 2
X____________(X- X)______(X – X)
44inch-64.36__-20.36______416.52
48-__________-16.36______267.64
53-__________-11.36______129.04
61-__________ -3.36_______ 11.28
61-__________ -3.36_______ 11.28
62-__________ -2.36________ 5.56
62-__________ -2.36________ 5.56
62-__________ -2.36________ 5.56
63-__________ -1.36________ 1.85
63-__________ -1.36________ 1.85
63-__________ -1.36________ 1.85
64-__________ -0.36________ 0.13
64-__________ -0.36________ 0.13
64-__________ -0.36________ 0.13
65-____________.64_________0.40
67-___________2.64_________6.96
68-___________3.64________13.24
68-___________3.64________13.24
68-___________3.64________13.24
68-___________3.64________13.24
68-___________3.64________13.24
68-___________3.64________13.24
69-___________4.64________21.53
69-___________4.64________21.53
69-___________4.64________21.53
69-___________4.64________21.53
70-___________5.64________31.80
70-___________5.64________31.80
70-___________5.64________31.80
71-__________6.64_________44.08
1931_____totals__________1168.78

____2____1168.78
___S__ =__30 – 1__ = 40.30????