Monique manages wildlife samples for Ducks Unlimited. Two samples of duck populations at a migratory site are shown in the table below. Which statement about the samples is true?Duck Pond SamplesSample 1Sample 2Mallard17Mallard21Wood Duck8Wood Duck7Green Wing Teal10Green Wing Teal8American Widgeon5American Widgeon6

The counts in the two samples are reasonably close for each duck type: mallards are 17 and 21, wood ducks 8 and 7, green-winged teal 10 and 8, and American widgeons 5 and 6. Monique can average each pair to estimate the mean frequency—for example, the mallard mean is (17 + 21) ÷ 2 = 19. The samples do not show such large differences that she needs to discard one or take another sample.

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