The drying rate in an industrial process is dependent on many factors and varies according to the following distribution.

minutes relative frequency
13 0.22
14 0.36
15 0.28
16 0.10
17 0.04

if this following sequence represents a simulation of 5 random numbers trials, r (0 less or equal thanrless or equal than1), what is the average drying time: r1 = 0.13 ; r2 = 0.09 ; r3 = 0.19, r4 = 0.21 , and r5 = 0.22.