Bounds

To 1 significant figure 80,000 people attended Manchester United's last game. What is the maximum number of people that could have actually attended the game?

• 85,000

• 84,900

• 84,990

• 84,999

The horsepower of a car is measured at 351 bhp to the nearest integer. What are the limits of accuracy for the actual horsepower?

• 350.5≤x≤351.5

• 350.5<x<351.5

• 350.5<x≤351.5

• 350.5≤x<351.5

A number, y, is rounded to 2 significant figures.

The result is 0.46

Write down the error interval for y.

• 0.445≤y<0.455

• 0.455≤y<0.465

• 0.45≤y<0.55

• 0.5≤y<0.6

Dionne has 60 golf balls.

Each of these golf balls weighs 42 grams to the nearest gram.

Work out the greatest possible total weight of all 60 golf balls.

Give your answer in kilograms.

• 2550

• 2520

• 2544

• 2490

A car is stopped for speeding travelling at 85mph to the nearest 5mph. What is the slowest speed it could have been doing?

• 84.5

• 80

• 84

• 82.5

p = 5.37 correct to 2 decimal places.

s = 2.9 correct to 1 decimal place.

Which is the correct working to find the greatest possible value of m?

• 
• 
• 
• 

a is 8.3 cm correct to the nearest mm

b is 6.1 cm correct to the nearest mm

Calculate the upper bound for c to 1 d.p.

You must show your working.

• 5.8

• 5.6

• 10.4

• 10.3

Jarek uses the formula shown to work out the area of a triangle.

For this triangle,

a = 7.8 cm correct to the nearest mm.

b = 5.2 cm correct to the nearest mm.

C = 63° correct to the nearest degree.

Calculate the lower bound for the area of the triangle to 3 s.f.

• 18.4

• 17

• 18

• 17.7