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)
Σ
x
(ii)
Σ
x
2
(iii) (
Σ
x)
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
Σ
x (
)
This gives the total growth over the last 8 years
(ii)
178.4016
Press the key that says
Σ
x
2
(
) This gives the sum
of the squares of the growth in each year
(iii) 512.5696
Press
Σ
x 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
-------------------------
+
+
Содержание fx-82MS
Страница 1: ...C A S I O f x 8 2 M S...
Страница 45: ...40 Mastering the Calculator using the Casio fx 82MS...
Страница 49: ...44 Mastering the Calculator using the Casio fx 82MS Your notes...
