Probability - AQA test questions - AQA

1

Which of these should NOT be used to represent probability?

Percentage

Ratio

Decimal

2

Which of the following is NOT a measure of probability?

Improper fraction

Decimal

Percentage

3

The probability of Paul being late for work is 0.55. What is the probability that he will be on time?

0.45

Cannot be calculated

4

What is the probability of selecting a vowel from the word MATHEMATICS?

\[\frac{4}{11}\]

\[\frac{7}{11}\]

\[\frac{3}{11}\]

5

What effect do more trials have on the estimate of a probability?

Becomes more reliable

Becomes more difficult to calculate

Becomes less reliable

6

The probability of a seed developing into a plant is given as 0.32. If 1,000 seeds are planted, how many plants would be estimated to grow?

320

7

A word is selected at random from a book. The number of letters it contains is counted and written down. This is repeated 50 times. Words containing fewer than 3 letters are ignored.

3 letters = 19

4 letters = 12

5 letters = 10

6 letters = 4

7 letters = 5

What is the relative frequency of selecting a word with more than 5 letters?

\[\frac{9}{50}\]

\[\frac{10}{50}\]

\[\frac{19}{50}\]

8

Two fair dice are thrown and the scores are added together. What is the probability of scoring a total of 5?

\[\frac{5}{36}\]

\[\frac{1}{9}\]

\[\frac{1}{6}\]

9

A counter is picked from a bag and then replaced. A second counter is then picked.

What is the missing value on the tree diagram?

Tree diagrams showing probability of getting red or green in the bag or box

10

50 pupils in a music school are questioned about which instruments they play. 37 pupils play the piano. 38 pupils play the violin. 28 pupils play both the violin and the piano. How many pupils play only the violin?