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A group of 150 students distributed equally to 5 groups ( A, B, C, D, E) have completed their test last week. For group A,
A group of 150 students distributed equally to 5 groups ( A, B, C, D, E) have completed their test last week. For group A, their results can be represented by a continuous random variable x, with its probability density function fx = ax - 1. The lowest score for students for group A is 6 marks, and their highest is 8 marks. Calculate the value of a
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