Question

Shana has a set of cards with a shape on each.

The probability of randomly selecting a triangle is 20%.
The probability of randomly selecting a square is 35%

What is the probability she selects a card that is NOT a triangle, replaces it, and then selects a card with a square?
WRITE YOUR ANSWER AS A PERCENT

Answer 1

28%

Explanation:

P(triangle) = 20% = 0.2

P(not a triangle) = 1 - P(triangle)

= 0.8

P(square) = 35% = 0.35

P(not triangle & then square)

0.8 × 0.35

0.28 × 100

28%