Answer:
a) 80% probability that x lies between 7 and 27. 
b) 28% probability that x lies between 6 and 13. 
c) 44% probability that x lies between 9 and 20. 
d) 28% probability that x lies between 11 and 18. 
Step-by-step explanation:
An uniform probability is a case of probability in which each outcome is equally as likely.
For this situation, we have a lower limit of the distribution that we call a and an upper limit that we call b.
The probability that we find a value x between c and d, in which d is larger than c, is given by the following formula.

Uniform distribution from a = 4 to b = 29
(a) Find the probability that x lies between 7 and 27. 
So 

80% probability that x lies between 7 and 27. 
(b) Find the probability that x lies between 6 and 13. 
So 

28% probability that x lies between 6 and 13. 
(c) Find the probability that x lies between 9 and 20.
 So 

44% probability that x lies between 9 and 20. 
(d) Find the probability that x lies between 11 and 18.
So 

28% probability that x lies between 11 and 18.