Estimate and Time

The scatter graph shows the relationship between the age of a car and its value.

Another car is 6 years old. Estimate the value of this car.

• £6000

• £2000

• £4000

• £3000

The chart shows the cost and length of some plumbing jobs. Estimate the cost of job lasting 3.5 hours.

• £150

• £180

• £210

• £240

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The scatter graph shows the relationship between the age of a car and its value.

Another car is 6 years old. Estimate the value of this car.

• £6000

• £4000

• £2000

• £3000

The scatter graph shows the relationship between the age of a car and its value.

Another car is worth £2500. Estimate the age of this car.

• 5 years

• 2 years

• 8 years

• 4 years

The scatter graph shows the relationship between two test scores of some students.

One student missed test 2 and scored 120 marks on test 1. Use the graph to estimate their result for test 2.

• 60

• 120

• 20

• 160

The scatter graph shows the relationship between the amount of rainfall and the number of umbrellas sold each day.

On another day, 30 umbrellas were sold. Estimate the amount of rainfall for that day.

• 5

• 10

• 12

• 8

The scatter graph shows the relationship between the The test score and the time spent revising for a group of students

One student was away for the test but spent 8 hours revising. Estimate their score on the test.

• 80%

• 100%

• 50%

• 60%

The scatter graph shows the relationship between the The test score and the time spent revising for a group of students

One student was away for the test but spent 5 hours revising. Estimate their score on the test.

• 80%

• 100%

• 20%

• 60%

The scatter graph shows the relationship between the The test score and the time spent revising for a group of students

One student scored 70 marks on the test. Estimate how many hours they spent revising.

• 6 hours

• 2 hours

• 3 hours

• 9 hours

Suppose a department store wants to estimate within 2 years the true mean age of the customers in its contemporary apparel department. The department store manager assumes a standard deviation of 7.5 years. How large a sample is required to estimate the true mean age with 95% confidence?

Round to the nearest whole number

• 56

• 112

• 420

• 224