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10 cards from this deck
Replacing symbols in equations with numerical values, then calculating
D=N(N−1)∑n(n−1)D = \frac{N(N - 1)}{\sum n(n - 1)}D=∑n(n−1)N(N−1)
Total number of individual organisms in the survey
Number of individuals of each different species
Sum of (add together all the values that follow)
Always solve brackets first
mag=image sizereal size\text{mag} = \frac{\text{image size}}{\text{real size}}mag=real sizeimage size
real size=image sizemag\text{real size} = \frac{\text{image size}}{\text{mag}}real size=magimage size
Use consistent units before substituting values
Judge if answer is reasonable & identify potential errors
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