Mathematics for IGCSE & O level - Probability (Section 3 - No. 21)
A bag contains 6 red balls and 4 black balls. Gita selects a ball, notes its color and replaces it. What is the probability Gita selects two red balls?
0.36
0.24
0.16
0.40
解释
The probability of picking a red ball is 6/10=0.6. As it is replaced, picking two red balls is: 0.6 * 0.6 = 0.36