Simplify:
4x + 3y - x - 5y
3x - 2y
What is 0.000000326 in scientific Notation?
3.26 x 10-7
How would you describe the symmetry of this data?
Negatively skewed
A factory’s quality control department has tested every 50th item produced for possible defects.
What type of sampling is this?
Systematic
137 = 5t3 - 2
135 = 5t3
27 = t3
t = 3
Line 2
What is the new measurement?
72cm
A survey asked 'how many brothers do you have?'. How would the response be classified?
Numerical, Discrete
Sam is the driver at fault in a car accident.
Which of the following will be covered by Sam's compulsory third-party CTP insurance?
a) repair for Sam's car
b) injury to the other driver
c) damage to the other driver's car
d) cost of repairing a building damaged in the accident
B
If d = 6t2, what are the values of t when 6=2400?
20 and -20
The length of a window is 2.4m. What is the percentage error for this measurement?
2.08%
A set of scores has the following five-number summary:
Min: 3
Q1: 8
Med: 9
Q3: 11
Max: 16
What is the LOWEST possible score before it is considered an outlier?
4.5
A 225-watt television is turned on for an average of 4 hours per day during off-peak periods for a week.
The television electricity is charged at $0.36/kWh.
How much does it cost to run the television for a week?
Graph the line neatly:
y = 2x - 6
Teacher to check
73.12m2
Christina has completed 3 tests and has a mean mark of 72%.
What percentage she have to get in her next test to increase her mean mark to 75%?
84%
The driving distance from Alex's home to his work is 20km. He drives to and from work five times each week. His car uses fuel at the rate of 8L/100km.
How much fuel does he use driving to and from work each week?
16L
The total cost ($C) of an excursion is given by the rule:
C = 2n + 5
If three extra students go on the excursion, by how much does the cost increase?
$6
How many square centimetres are in 0.0075m2 ?
75
Give examples of 2x SURVEY QUESTIONS that could be asked for each type of data below:
a) categorical ordinal
b) categorical nominal
c) numerical discrete
d) numerical continuous
Teacher to check
In a survey of 200 students, 180 of them were found to use social media.
Based on this, approximately how many students would use social media if 75000 students were surveyed?
67500