Step 1: Find the total number of balls in side the bag
GIVEN: Number of red balls = 3
Number of black balls = 5
Total number of balls = 5 + 3 = 8
Step 2: Find the probability of drawing red balls
Number of favorable outcomes = number of red balls = 3
(i) Probability of drawing red balls = \frac{\text{Number of balls}}{\text{ Total number of balls}} = \frac{3}{8}
Step 3: Find the probability of drawing not red balls
Number of favorable outcomes = number of not red balls = number of block balls = 5
(ii) Probability of drawing black balls = \frac{Number\ of\ block\ balls}{Total\ number\ of\ balls}=\frac{5}{8}