Correct Statements? Which of the following statements are true? a. If each of 25 sample values is

Correct Statements? Which of the following statements are true?

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a. If each of 25 sample values is equal to 20 min, the standard deviation of the sample is 0 min. b. For any set of sample values, the standard deviation can never be a negative value. c. If the standard deviation of a sample is 3 kg, then the variance is 9 kg. d. If the variance of a sample is 16 sec, then the standard deviation is 4 sec. e. If the standard deviation of a sample is 25 cm, then the variance is 5 cm.