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Suppose that 69% of people own cats. If you pick two people at random, what is the probability that they both own a cat?

Give your answer as a decimal (to at least 3 places) or a fraction.

Sagot :

To find the probability that both of two randomly picked people own a cat, given that the probability of one person owning a cat is 69%, follow these steps:

1. Express Probability as a Decimal:
First, convert the given percentage to a decimal form. The probability that one person owns a cat is 69%, which can be written as:
[tex]\[ P(\text{one person owns a cat}) = 0.69 \][/tex]

2. Use Independence of Events:
The probability that two people both own a cat is found by multiplying the probabilities of each individual owning a cat. This is because the ownership of a cat by each person is an independent event.

3. Calculate Combined Probability:
Therefore, the probability that both randomly picked people own a cat is:
[tex]\[ P(\text{both own a cat}) = P(\text{one person owns a cat}) \times P(\text{one person owns a cat}) \][/tex]
Substituting the values:
[tex]\[ P(\text{both own a cat}) = 0.69 \times 0.69 \][/tex]

4. Perform the Multiplication:
[tex]\[ 0.69 \times 0.69 = 0.4761 \][/tex]

After going through these steps, the probability that both randomly picked people own a cat is:
[tex]\[ 0.476 \quad (\text{rounded to three decimal places}) \][/tex]