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Suppose that a histogram of a data set is approximately symmetric and “bell shaped”. Approximately percent of the observations are within three standard deviation of the mean?

  • A

    50

  • B

    68

  • C

    95

  • D

    99.7

99.7 Is the correct option, Check your your study materials for clarification Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately percent of the observations are within three standard deviation of the mean?(From your material, the answer is) 99.7