A research company found that the tyre lifespan for the local town vehicles is normally distributed with a mean of 40 000km and a standard deviation of 4000km. If a random sample of 45 vehicles is selected, what is the probability that the mean lifespan of the tyres for these 45 vehicles is between 39 000 and 41 500km?

1. 0:9476

2. 0:4535

3. 0:4941

4. 0:0059

5. 0:0465