Answer:
120
Step-by-step explanation:
Each small square represents 10 mice. The histogram below 10 grams is 3 small squares high and bins wide. The number of mice is 30×4 = 120.
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You can tell each small square represents 10 by adding the vertical lengths of the bars. It comes to 100 small squares, representing 1000 mice. Hence 1 small square represents 10 mice.
∑(bins)(squares high) = ...
4×3 +2×8 +2×11 +1×23 +1×19 +4×2 = 12 +16 +22 +23 +19 +8 = 100
