24 rail cars is what % of 40 rail cars
2 answers:
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Answer:
0.12 = 12% probability of first selecting a PRIME number, replacing it, then selecting a number less than or equal to 3
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
Probability of independent events:
Suppose we have two events, A and B, that are independent. The probability of both happening is given by:
In this question:
Event A: Selecting a prime number.
Event B: Selecting a number less than or equal to 3
Probability of selecting a prime number:
Between 1 and 10, we have 4 prime numbers(2,3, 5 and 7), out of 10. So
Probability of selecting a number less than or equal to 3:
Three numbers(1,2,3) out of 10. So
Probability of both:
0.12 = 12% probability of first selecting a PRIME number, replacing it, then selecting a number less than or equal to 3