Please help answer 2 short muliptly choice questions. Thank you. - 1) Which of t
ID: 3434535 • Letter: P
Question
Please help answer 2 short muliptly choice questions. Thank you.
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1) Which of the following is correct?
A. A continuous random variable has a probability density function but not a cumulative distribution function.
B. A discrete random variable has a probability mass function but not a cumulative distribution function.
C. A continuous random variable has a probability mass function, and a discrete random variable has a probability density function.
D. A continuous random variable has a probability density function, and a discrete random variable has a probability mass function.
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2) Which of the following is not a characteristic of a probability density function f(x)?
A. f(x) ? 0 for all values of x.
B. f(x) is symmetric around the mean.
C. The area under f(x) over all values of x equals one.
D. f(x) becomes zero or approaches zero if x increases to +infinity or decreases to -infinity.
Explanation / Answer
1) Which of the following is correct?
D. A continuous random variable has a probability density function, and a discrete random variable has a probability mass function.
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2) Which of the following is not a characteristic of a probability density function f(x)?
B. f(x) is symmetric around the mean.