Understand the concept
Probabilities describe chance; variance measures spread.
Probability of two heads in two fair tosses
- Step 1: Equally likely outcomes HH,HT,TH,TT
- Step 2: one is HH.
Final answer: 1/4
Probability of at least one head in two tosses
Show the answer
3/4
Try another similar question and explain each step aloud. Refer to your school syllabus for topic level and notation.