UCAT Decision Making 5

Question 1

A bar chart shows monthly sales. January: 200, February: 250, March: 300, April: 280. What was the mean monthly sales over these four months?

Accepted Answer

257.5

Answer

Mean = (200 + 250 + 300 + 280) / 4 = 1030 / 4 = 257.5.

Question 2

P, Q, R, S complete tasks in order. If P fails, Q takes over. If both fail, R takes over. Only S always succeeds. P has a 0.2 failure rate. What is the probability P completes the task?

Accepted Answer

0.8

Answer

P succeeds with probability 1 − 0.2 = 0.8. The question asks only about P completing it, not the overall system.

Question 3

A graph shows a negative correlation between hours of exercise and resting heart rate. This means:

Accepted Answer

People who exercise more tend to have lower resting heart rates

Answer

Negative correlation means as one variable increases, the other tends to decrease. This describes an association, not causation.

Question 4

A puzzle: 5 people each shake hands with every other person exactly once. How many handshakes occur?

Accepted Answer

10

Answer

C(5,2) = 10. Each unique pair shakes hands once.

Question 5

'All prescribed medications have side effects. Aspirin has side effects.' Does this prove aspirin is prescribed?

Accepted Answer

No — having side effects does not prove it is prescribed, as non-prescribed drugs can also have side effects

Answer

The first statement gives a property of all prescribed medications, but does not say only prescribed medications have side effects. Therefore side effects do not prove prescription status.

UCAT Practice Test

UCAT Practice Test

UCAT Decision Making 5