Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
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Calculate the average of each group and choose the appropriate sign (?):
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Calculate the average of each group and choose the appropriate sign (?):
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Calculate the average of each group and choose the appropriate sign (?):
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Calculate the average of each group and choose the appropriate sign (?):
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Calculate the average of each group and choose the appropriate sign (?):
Calculate the average of each group and choose the appropriate sign (?):
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