The statement that is true is, the sum of the numbers in the group must be negative, the correct option is B.
Average is the mean of the data set obtained by summing all the values of the data set and then dividing it by the number of data in the set..
Average = ( Sum of all data ) / Number of data
The number of data cannot be negative, so the sum of the data has to be negative if the average is negative.
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