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Which of the following is/are true about a normal distribution? I). It is a bimodal distribution. II). It can be characterized completely by a single parameter. III). It ranges from negative infinity to positive infinity. IV). It is positively skewed.
Correct Answer: B
A normal distribution is completely characterized by 2 parameters, mean and variance. It ranges from negative infinity to positive infinity, has a single mode or peak (occurring at the mean), is symmetrical about the mean and has zero skewness.