Combined events and tree diagramsIB MYP Maths Extended: Mind map

Exam questions on Combined events and tree diagrams

1. A spinner in a board game played in Nairobi lands on green with probability $0.3$ and on yellow with probability $0.7$. It is spun twice, and the two spins are independent.
   Find the probability that at least one spin lands on yellow.2 marks
2. In a dormitory in Seoul, a drawer contains $6$ black socks and $4$ white socks. Two socks are taken at random, one after the other, without replacement.
   Find the probability that both socks are white.2 marks
3. A basketball player in Manila scores each free throw with probability $0.7$, independently of her other throws. She takes three free throws.
   Find the probability that she scores exactly two of the three throws.3 marks