Math

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I am stuck on several probability questions.


A spinner that has 15 equal sized sections numbered 1 to 15 is spun twice. What is the probability the spinner lands on an odd number and then on an even number? A. 56/225 B. 169/225 C. 1/15 D. 21/225 I chose A. 56/225 because 8/15 x 7/15 = 56/225.

Is this correct?


A bag contains 9 metal balls, 10 hollow balls, 4 glass balls and 18 plastic balls. What is the probability of choosing a glass or hollow ball? A. 24.6% B. 38.9% C. 35.4% D. 34.1%
What is the probability of receiving a 6 or a 9 from a deck of 52 cards and an ace or a King? A. 1.7% B. 15% C. 2.4% D. 5.6%

  • Math -

    Yes
    D
    I don't know sorry

  • Math -

    If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

    8/15 * 7/15 = ?

    Either-or probabilities are found by adding the individual probabilities.

    4/41 + 10/41 = ?

    With replacement, 6 or 9 = 8/52 and Ace or King = 8/52.

    Without replacement, 6 or 9 = 8/52 and Ace or King = 8/51.

    Again, if the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

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