Casio fx-82MS Manual Book page 48

Calculator keys:
2
( ) (
100 90 – 50 60
(xi) --------------------------- - + ------------------------ -
90
Calculator keys:
2. The following data is on growth (in $m) in an economy over a 8 year period:
2.5 6.2 -2.1
Calculate (i) Σx (ii) Σx
To do this on the calculator, you must be in SD mode. Enter the data:
mode 1 2.5 M+ 6.2 M+ (–) 2.1 M+ .04 M+ 8.2 M+ 7.4 M+ 2.1 M+ (–) 1.7 M+
(i) 22.64
(ii) 178.4016
(iii) 512.5696
÷ 6 + .2 x
2 2
0.1366 x
2 2
) ( )
– 20 30 –
+ ------------------------ -
60 30
÷ 90 + (50 – 60) x
2
(100 – 90) x
0.04 8.2 7.4
2 2
(iii) (Σx)
Press the key that says Σx (
This gives the total growth over the last 8 years
Press the key that says Σx
of the squares of the growth in each year
Press Σx and x
2
. This gives the square of the sum of the growth.
Mastering the Calculator using the Casio fx-82MS
√ =
÷ 6 =
x 2.015 =
+ 4.1333 – 3 =
4.1333 – 3 –
= 6.1111
÷ 60 + (20 – 30) x
2
2.1 -1.7
Explain in words what each of these mean.
2
(
43
=
÷ 30 =
2
)
) This gives the sum