Chapter 7 - Section 7.2 - Relative Frequency - Exercises - Page 464: 14

No

The properties of relative frequency distributions must be true for the given distribution. The relative frequency of each outcome is a number between 0 and 1. That is true. The relative frequencies of all the outcomes add up to 1. That is not true, because $0.2+0.1+0.2+0.1=0.6$ Therefore the given distribution cannot be a relative frequency distribution.