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For normal dice, and assuming "combined" refers to the sum, the answer is 7.
You use the mid-point of the range.
Work at it.
Five skill areas are tested. Math, science, English, reading, and combined English and Writing. These scores are then averaged to determine your composite score.
z score = (test score - mean score)/SD z score = (87-81.1)/11.06z score = 5.9/11.06z score = .533You can use a z-score chart to calculate the probability from there.