A student investigated the rate of reaction between zinc and sulfuric acid. The table below shows the volume of hydrogen gas collected after 60 seconds in four repeat tests:
| Test | Volume of gas collected in cm3\text{cm}^3cm3 |
|---|---|
| Test 1 | 64 |
| Test 2 | 67 |
| Test 3 | 63 |
| Test 4 | 41 |
Calculate the mean volume of gas collected at 60 seconds.
Do not include the anomalous result in your calculation.
Give your answer to 2 significant figures.