In a jar, there are ten marbles, of which four are numbered 1, three are numbered 2, two are numbered 3, and one is numbered 4. Seven marbles are drawn at random, one after another and with replacement, and X denotes the count of the selected marbles that are numbered either 2 or 3.
P(x)=?
What is the probability that 2 or 3 is selected?
P(x)=?
What is the probability that 2 or 3 is selected?
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Since the number of "2 or 3" marbles in the bag is equal to 5, the probability of choosing a 2 or a 3 is simply 5/10 = 1/2.
Your problem does not state "how many" of the seven marbles must be a 2 or 3. It just says seven marbles are drawn.
For example, if it said what is the probability that 3 of the seven marbles are a 2 or 3, then you could use the binomial to calculate it.
Hope that helps
Your problem does not state "how many" of the seven marbles must be a 2 or 3. It just says seven marbles are drawn.
For example, if it said what is the probability that 3 of the seven marbles are a 2 or 3, then you could use the binomial to calculate it.
Hope that helps