Solving 'statistical' problems - OCR test questions - OCR

The table shows the probabilities of scoring a number on a die when rolled 100 times. Estimate how many 2s would be rolled if the die was rolled 500 times.

Score012345
Probability0.030.243xx0.190.3

1

Which area of maths is needed to answer this question?

2

What is the probability of scoring a 2?

3

Estimate the number of 2s if the die was rolled 500 times.

4

The table shows the time taken for 64 office workers to travel to work on a Friday. Work out the number of staff members who took less than 18 minutes.

Time values
Least time12
Greatest time73
Median24
Lower quartile18
Upper quartile36

Which topic is maths is most relevant to answering this question?

5

What percentage of staff travelled to work in 18 minutes or less?

6

How many staff took 18 minutes or less to travel to work?

7

40 pupils in a class score a mean mark of 65 in a maths exam. The averages for boys and girls are compared. The 22 girls in the class score a mean mark of 71. What is the mean mark for the boys?

Which information is most important?

8

What was the total number of marks scored by the class?

9

What was the total number of marks scored by the girls?

10

What was the mean mark of the boys' scores?