Formulas Flashcards
How do you calculate the median?
n+1 / 2
How do you calculate the Lower Quartile?
n+1 / 4
How do you calculate Upper Quartile?
3(n+1) / 4
How do you calculate Frequency Density?
Frequency / Class Width
How do you calculate Inter Quartile Range?
Upper Quartile - Lower Quartile
What is the Cosine Rule?
a²= b² + c² - 2bc Cos A
What is the Sine rule for Angles?
sinA / a = sinB / b = sinC / c
What is the Sine rule for Sides?
a / sinA = b / sinB = c / sinC
How do you calculate Non-right angle triangles?
Area = 1/2 a b sinC (But can be anything exp. 1/2 c b sinA)
What does A n B?
A and B
What does A u B mean?
A or B
What does A’ mean?
Not A
What does a closed (coloured) circle and open circle mean in inequalities?
Closed - ≤ or ≥
Open - < or >
What is the equation for completing a square?
(x + a)² + b
How do you calculate the turning point and the coordinates of that?
(x + a)² - b –> (-a , b)
How do you complete the square when the co-efficent is x² ?
a(x + b)² + c
What is the quadratic formula?
x = −b ± √(b2 − 4ac) / 2a
X^1/n
n^√x
X^-n
1/X^n
√a x √b =
√a x b
- 3√2 x 3√2 =
2. √8 + √18
- 9√4 = 9 x 2
2. √4√2 + √9+√2 = 5√2
How do you find the Nth Term of a Geometric sequence?
Un = a x r ^ n-1
Find the Arithmetic proggression of u1, u2, u3
u2 - u1 = u3 - u2
Find the Geometric proggression of u1, u2, u3?
u2/u1 = u3/u2
