Casio fx-82MS

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