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newstatstudent

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  • statistics question - area codes?

    I am trying to solve the following statistics question:

    I am looking for three-digit area codes with 1 or 0 in the second digit. Exclude codes ending in 00 or 11 and codes beginning with 0 or 1. How many area codes are possible under these conditions?

    Please help me by explaining, because if you just tell me the answer, I can't learn how to solve it. Actually, I know the answer, but not how to get there.

    Thanks in advance for your help.

    1 AnswerMathematics1 decade ago

  • probability question regarding two cards?

    I have been struggling with a probability question tonight and hope someone can help me. The actual question reads:

    "Two cards are randomly selected without replacement from a shuffled deck. Find the probability of getting an Ace on the first card and a spade on the second card."

    So as I understand it, the probability of getting an ace on the first draw is 4/52, but what is the probability of getting a spade on the second card? Because I think it could be 13/51, but what if I picked the ace of spades on the first draw, then it would be 12/51?

    Please help by explaining why (giving me the answer only does not help me to learn).

    Thank you!

    3 AnswersMathematics1 decade ago