Statistics

A two-digit number is written down at random.Find the probability that the number will be

A)Smaller than 20
B)Even
C)Multiple of 5

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  1. number of two-digit numbers:
    10, 11, ... , 99, ----> 90 of them (1 - 9 are missing)

    smaller than 20:
    10,11, ... , 19 ----> 10 of them
    prob( < 20) = 10/90 = 1/9

    use the same type of analysis for the two other parts, let me know what you get.

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  2. 10/90
    =1/9

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  3. Nice
    It will to self study

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  4. i cannot understand

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