Math Skills Quiz for year 8

What type of correlation is shown in a scatter graph where as one variable increases, the other variable decreases?

• Positive correlation

• Negative correlation

• No correlation

• Constant correlation

If a shirt originally costs $50 and is marked up by 20%, what is the new price?

• $60

• $55

• $70

• $65

A car loses 15% of its value each year. If the car is initially worth $20,000, what will it be worth after one year?

• $17,000

• $18,000

• $16,500

• $17,500

What is the equation of a straight line graph that passes through the origin and has a gradient of 5?

If an item costs $120 and is sold at a 25% discount, what is the sale price?

• $90

• $95

• $100

• $105

A scatter graph shows the number of hours studied and the marks obtained. If there is a cluster of points along a line that slopes upwards from left to right, what does this indicate?

• As the number of hours studied decreases, marks obtained increase.

• As the number of hours studied increases, marks obtained decrease.

• There is no relationship between hours studied and marks obtained.

• As the number of hours studied increases, marks obtained also increase.