Mathematics for IGCSE & O level - Probability (Section 8 - No. 3)
A pin falls 300 times. The probability of the pin landing point up is 0.3. How many times is the pin expected to land point up?
30
90
120
210
คำอธิบาย
Expected frequency = P(event) * total trials. 0.3 * 300 = 90.