Foundation November 2024 Paper 2 Q7
7 Here are the ages, in years, of 8 children.
14 10 10 13 15 9 15 10
(a) Work out the mean age. (2)
(b) Work out the range of the ages. (2)
One of the children is chosen at random.
(c) On the probability scale below, mark with a cross (\(\times\)) the probability that this child has an age of 15
| Answer | Mark | Mark scheme |
|---|---|---|
| 12 | M1 | for method to find mean, eg \((14 + 10 + 10 + 13 + 15 + 9 + 15 + 10) \div 8\) or \(96 \div 8\) |
| A1 | cao |
Additional guidance
Allow one error or omission but must divide by 8
| Answer | Mark | Mark scheme |
|---|---|---|
| 6 | M1 | for \(15 - 9\) or \(9 - 15\) or 9 to 15 |
| A1 | cao |
Additional guidance
Condone eg 9, 15 but not 9 + 15
| Answer | Mark | Mark scheme |
|---|---|---|
| cross at \(\tfrac{1}{4}\) | B1 | for cross (or mark) at \(\tfrac{1}{4}\) |
Additional guidance
Accept any mark near to \(\tfrac{1}{4}\) if the intention is clear; do not accept if additional marks are shown