Exam scores in a random sample of students were 0, 50, 50, 70, 70, 80, 90, 90, 90, 100. Which statement is incorrect?
A)The standard deviation is 29.61.
B)The data are slightly left-skewed.
C)The midrange and mean are almost the same.
D)The third quartile is 90.

Question

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The Answer of Exam scores in a random sample of students were 0, 50, 50, 70, 70, 80, 90, 90, 90, 100. Which statement is incorrect?
A)The standard deviation is 29.61.
B)The data are slightly left-skewed.
C)The midrange and mean are almost the same.
D)The third quartile is 90.

Exam Scores in a Random Sample of Students Were 0