Please review the answered questions, validate, and show what is wrong.

Please review the answered questions, validate, and show what is wrong.

The commuter trains on the Red Line for the Regional Transit Authority (RTA) in Cleveland, OH, have a waiting time during peak rush hour periods of eight minutes ("2012 annual report," 2012).

1. Find the height of this uniform distribution. Answer: 0.125
2. Find the probability of waiting between four and five minutes. Answer: 0.500
3. Find the probability of waiting between three and eight minutes. Answer: 0.625
4. Find the probability of waiting five minutes exactly. Answer: 0