Ian wants to train as a translator.
He sits language tests to help him decide in which language he should specialise.
He sits a Spanish test, a Mandarin test and a Russian test.
The table gives the mean mark and the standard deviation of the marks for all the candidates in each of the three tests.
| Test | Mean mark | Standard deviation |
|---|---|---|
| Spanish | 65 | 2 |
| Mandarin | 72 | 5 |
| Russian | 79 | 4 |
Ian scored 68 marks in the Spanish test and 78 marks in the Mandarin test.
Calculate the standardised score for the Spanish test and for the Mandarin test.
In the Russian test, Ian had a standardised score of -1.5.
Calculate Ian's mark in the Russian test.
