Variance and standard deviation of a discrete random variable
6:26
Khan Academy
Variance and standard deviation of a discrete random variable
We learn how to calculate the mean and standard deviation of a discrete random variable. The concept of a random variable is explained, along with methods to calculate its expected value (mean) and measure its spread (variance and standard deviation). A practical example makes the concept easier to understand.
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SOLVED: Consider the discrete random variable X given in the table below. Calculate the mean, variance, and standard deviation of X10 0.09 0.0915 0.1119 0.14P(X)0.09 0.120.3610.30What is the expected value of X?(All answers should be rounded to one more decimal place than the raw data:) (Round to one decimal place: )
SOLVED: Consider the discrete random variable X given in the table below. Calculate the mean, variance, and standard deviation of X10 0.09 0.0915 0.1119 0.14P(X)0.09 0.120.3610.30What is the expected value of X?(All answers should be rounded to one more decimal place than the raw data:) (Round to one decimal place: )
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SOLVED: Consider the discrete random variable X given in the table below. Calculate the mean, variance, and standard deviation of X10 0.09 0.0915 0.1119 0.14P(X)0.09 0.120.3610.30What is the expected value of X?(All answers should be rounded to one more decimal place than the raw data:) (Round to one decimal place: )
SOLVED: Consider the discrete random variable X given in the tab…
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