Sharp EL-531LH - Page 33

30 Mastering the Calculator using the Sharp EL-531LH
(b) The sample of snail foot lengths
Answers:
(a) Rainfall statistics
mean:
= 1 265.3 mm
standard deviation:
s = 336.4 mm (sample standard deviation)
variance:
s
2
= 113141.7 mm
2
(b) Snail statistics
mean:
= 3.4 cm
standard deviation:
s = 0.70 cm
variance:
s
2
= 0.49 cm
2
Snail foot length (cm)
2.2 4.1 3.5 4.5 3.2 3.7 3.0 2.6
3.4 1.6 3.1 3.3 3.8 3.1 4.7 3.7
2.5 4.3 3.4 3.6 2.9 3.3 3.9 3.1
3.3 3.1 3.7 4.4 3.2 4.1 1.9 3.4
4.7 3.8 3.2 2.6 3.9 3.0 4.2 3.5
x
x