Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards. The probability distribution of number of aces is given by:
Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards. The probability distribution of number of aces is given by:
Solution
Drawing 2 cards with replacement from a deck of 52 cards. After picking the first card, it's returned to the deck before the second draw.
Total cards in deck = 52
Number of aces = 4
Number of non-aces = 48
For any single draw:
P(getting an ace) =
P(not getting an ace) =
For X = 0 (no aces), both cards must be non-aces.
P(X = 0) = P(1st card is not ace) × P(2nd card is not ace)
For X = 1 (exactly one ace), there are two ways:
First card is ace, second card is non-ace:
First card is non-ace, second card is ace:
P(X = 1) =
For X = 2 (both aces), both cards must be aces.
P(X = 2) = P(1st card is ace) × P(2nd card is ace)
The probability distribution is:
| x | 0 | 1 | 2 |
|---|---|---|---|
| P(x) |
Therefore, the answer is Option 3.
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