Answer
(b) 0.05
Work Step by Step
There are two possible values for a coin: tail or head.
There are ten numbers from 0 to 9: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
By the Fundamental Counting Principle (page 132):
There are: $2\times10=20$ ways to toss a coin and select a number from 0 to 9.
But, tossing tails and selecting a 3 is one of the 20 possibilities. So, by the classical probability (page 134):
$P(tossing~a~tails~and~selecting~a~3)=\frac{1}{20}=0.05$
