Question

Skeletal data of Cayo Santiago rhesus macaques
Tattoo ID	Age (years)	Sex	Canine length (cm)
			left	right	mean
639	6	male	2.10	2.10	2.10
OY	7	male	2.00	2.30	2.15
E08	10	male	2.60	2.50	2.55
520	15	male	2.40	2.40	2.40
3L	5	female	1.10	1.20	1.15
E835	6	female	1.00	1.00	1.00
I72	7	female	1.10	1.00	1.05
B72	15	female	0.60	0.60	0.60
CALCULATE THE MEAN AND Standard Deviation				Mean	SD
Canine length			male
			female

*Standard deviation (SD) tells us about the amount of variation in the data. A large SD means there is a lot of variation around the mean, while a small SD means the data points all fall very close to the mean.

Answer 1

The symbol for Standard Deviation is σ (the Greek letter sigma).

This is the formula for Standard Deviation:

Standard Deviation, s: 0.72892615080907

Count, N:	16
Sum, Σx:	26
Mean, x̄:	1.625
Variance, s2:	0.53133333333333

Steps

s2 =	Σ(xi - x̄)2 N - 1
=	(2.1 - 1.625)2 + ... + (0.6 - 1.625)2 16 - 1
=	7.97 15
=	0.53133333333333

s =	√0.53133333333333
=	0.72892615080907