Question

Given that the average finishing time at the 2017 Australian inline marathon was approximately 2 hours and 24 minutes. The standard deviation was approximately 32.5 minutes. Assume the finishing times are normally distributed.

1. If a skater wants to finish in the top 10% of the fastest times, what time does the skater need? Fastest 10% are those with LOW times.

1. 102.4 minutes
2. 190.3 minutes
3. 176.5 minutes
4. 210.4 minutes

2. What is the probability of finishing in less than 1 hour and 50 minutes?

1. 0.18
2. 0.15
3. 0.85
4. 0.72

3. What is the probability of finishing in exactly 144 minutes?

1. 0.50
2. 0.67
3. 0.15
4. 0.00

4. What is the probability of finishing in more than 2 hours and 15 minutes?

1. 0.84
2. 0.61
3. 0.58
4. 0.39

Answer 1