4400 Higher June 2008 Paper 4 Q5
5 The table shows information about the number of letters delivered to Manjit’s house each day.
| Number of letters delivered | Probability |
|---|---|
| 0 | 0.2 |
| 1 to 5 | 0.5 |
| 6 to 10 | 0.2 |
| More than 10 | 0.1 |
(a) There are 30 days in June.
Calculate an estimate of the number of days in June on which the number of letters delivered is 0 (2)
Calculate an estimate of the number of days in June on which the number of letters delivered is 0 (2)
(b) Find the probability that on a particular day the number of letters delivered is 6 or more. (2)
| Scheme | Marks |
|---|---|
| \(30 \times 0.2\) | M1 |
| 6 | A1 |
| (2) |
Notes
M1: or \(30 \div 5\)
| Scheme | Marks |
|---|---|
| 0.2 + 0.1 | M1 |
| 0.3 oe | A1 |
| (2) | |
| (4 marks) |