List for formulas for 'O' Level to memorise for E Math.

1. Sec
4
Formulas
»
Standard
Deviation
Where
x =
mean
Standard
Deviation
of
an
Ungrouped
Data
Set
N =
no.
of
terms
∑x 2
2
Standard
Deviation
=
− x
N
Standard
Deviation
of
an
Grouped
Data
Set
Standard
Deviation
=
∑ fx − 2
2
∑f x
»
Multiplication
of
Matrices
! a b $! e f $
e.g
# &# &
" c d %# g h &
" %
! ae + bg af + bh $
=
# &
# ce + dg cf + dh &
" %
»
Simple
&
Compound
Interest
Where
P
=
principal
Simple
Interest
i %
=
interest
rate
per
annum
I
=
P × i % × n
n
=
no.
of
years
A
=
P + I
I
=
interest
Compound
Interest
A
=
accumulated
amount
i n
An
=
P(1 + )
100
»
Hire
Purchase
&
Utilities
Bills
Total
Interest
=
Loan × Flat
Rate × Loan
Period
(In
Years)
Repayment
Amount
=
Loan
+
Total
Interest
Repayment Amount
Monthly
Repayment
(Installment)
=
Loan Period (In Months)
»
Money
Exchange
&
Taxation
Chargeable
Income
=
Assessable
Income − Personal
Relief
Assessable
Income
=
Annual
Income − Donation

2. Sec
3
Formulas
»
Functions
&
Graphs
Graphs
of
y = ax
(where
n=1)
For
a>0,
For
a<0
Graphs
of
y = ax 3
(where
n=3)
For
a>0,
For
a<0

3. a
Graphs
of
y =
(where
n=-­‐1)
x
For
a>0,
For
a<0
a
Graphs
of
y =
(where
n=-­‐2)
x2
For
a>0,
For
a<0

4. Graphs
of
y = a x
(where
a
is
a
positive
number)
y = a x
y = a x