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To find the mean number of siblings, we first need to calculate the total number of siblings and the total number of 6th graders surveyed.
Total number of siblings = (0*3) + (1*12) + (2*5) + (3*2) + (4*0) + (5*1) = 0 + 12 + 10 + 6 + 0 + 5 = 33
Total number of 6th graders surveyed = 3 + 12 + 5 + 2 + 0 + 1 = 23
Now, we can calculate the mean number of siblings by dividing the total number of siblings by the total number of 6th graders surveyed:
Mean number of siblings = 33 / 23 ≈ 1.43 siblings
Therefore, the mean number of siblings for the 6th graders surveyed is 1.43 siblings.