October Half Term Test

Question 1

What is the formula for arithmetic sequences

Answer 1

An + B

A being the common difference
n being the position
B being the zero term

Question 2

What is the formula for quadratic sequences

Answer 2

an squared + bn + c

Question 3

What is the formula for geometric sequences

Answer 3

a x r to the n-1

A being the 1st term
r being the common ratio

Question 4

What is the formula for median position

Answer 4

n + 1 / 2

Question 5

What is the formula for lower quartile

Answer 5

n + 1 / 4

Question 6

What is the formula for upper quartile

Answer 6

3 (n+1) / 4

Question 7

What is the formula for interquartile range

Answer 7

UQ - LQ

Question 8

How do you compare two sets of data

Answer 8

• compare a suitable average
• compare a measure of spread
• use specifics
• make an argument

Question 9

When do we change the inequality sign round?

Answer 9

When we multiply or divide by a negative number

Question 10

How would you figure out:

-4 < 2n < or equal to 3

Answer 10

1) Split them into -4 < 2n and 2n

Question 11

When we draw graphs of inequalities what kind of lines do we use?

Answer 11

if its < or equal to or > or equal to we use a solid line

if its < or > we use a dashed line

Question 12

What is the formula for finding a suitable degree of accuracy

Answer 12

m = √s / t

Question 13

When finding a suitable degree of accuracy how do we work it out?

Answer 13

1) calculate the lower bound for the answer : √s (min) / t (max)
2) calculate the upper bound for the answer √ s(max) / t (min)
3) choose the most appropriate value that both bounds round to.