7, 7, 7, 9, 11, 13
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At least two of the numbers must be 7 since the mode is 7.The mode is number which occurs most.However, the third number cannot be 7 since the mean is 6.The mean of a list of numbers is found by adding up the numbers in the list and dividing by how many numbers are in the list.Now since 7 + 7 = 14 the final number must add up to a total of 18 as 18/3 = 6.Therefore the final number in the list is 4.The numbers are 4, 7, 7.
There is no mode.
4, 6, 7, 7
Mean = 6 Mode = 5.
3, 3, 5, 9, 10