Answer: 
In decimal, 
In percentage,
Step-by-step explanation:
Given: Christopher mixes the letters S, E, L, E, C, T, E, and D thoroughly.
Total number of letters= 8
The number of consonant=5 (S, L, C, T, D )
The number of letters which are not consonants (vowels)=8-5=3
Now, the probability that Allen will NOT select a consonant is given by :-


In decimal, 
In percentage,