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2 May, 18:24

Which of the following random variables is not discrete?

A) The number of classes taken in one semester by a student

B) The annual rainfall in a city

C) The attendance at a football game

D) The number of patients treated at an emergency room in a day

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  1. 2 May, 21:35
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    b) The annual rainfall in a city

    Step-by-step explanation:

    Remember, a discrete variable is one that can only take a finite number of values between any two values of a characteristic and a continuous variable is one that can take an infinite number of values between any two values of a characteristic.

    a) Observe that the variable x='classes taken in one semester' can take the values 0,1,2, ..., n.

    Then the variable x is discrete

    b) Observe that the variable x='annual rainfall in a city' can take the values 2in, 1.6in, 5.1 in, 0.1in

    Then, the variable x can be take a infinite number of values between two number. So x isn't a discrete variable.

    c) The variable x='attendance at a football game' can take the values 3000,5000 ... n. And never will be a decimal number because There cannot be a personal decimal number. Therefore, x is a discrete variable.

    d) The variable x='patients treated at an emergency room in a day' can take the values 1,2,3, ..., n. And never will be a decimal number because There cannot be a personal decimal number. Therefore, x is a discrete variable.
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