Casio fx-82MS

30 Mastering the Calculator using the Casio fx-82MS
(b) The sample of snail foot lengths
Answers:
(a) Rainfall statistics
mean:
µ = 1 265.3 mm
standard deviation:
= 336.4 mm
variance:
σ
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
σ
n-
1
x