Final answer:
The theoretical probability of spinning an even number on a spinner with 5 equal sections is 2/5 or 0.4, thereby making option C) 0.4 the correct answer.
Step-by-step explanation:
The theoretical probability of spinning an even number on a spinner with 5 equal sections labeled 1-5 is determined by the number of even outcomes or favorable outcomes divided by the total number of outcomes.
Since the labels of the spinner are the integers from 1 to 5, the even numbers present are 2 and 4.
Therefore, there are 2 even numbers out of 5 possible outcomes.
The probability thus is 2/5 which can also be expressed as a decimal, which is 0.4. So the correct answer is C) 0.4.