Instruction 6.6 Suppose the Time Interval Between Two Consecutive Defective Light Bulbs

Short Answer

Instruction 6.6
Suppose the time interval between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes.
-Referring to Instruction 6.6,the probability is 50% that the time interval between two consecutive defective light bulbs will fall between which two values that are the same distance from the mean?