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Question:
The graph above records the death rate of two types of male flies a certain number of days after a chemical pesticide is sprayed. What is the probability a male methuselah fly will be alive 75 days after exposure to the pesticide?
A
\( \frac{\mathrm{1} }{\mathrm{5} } \)
explanation
On the x-axis, 75 days corresponds to roughly 20% on the y-axis. Since about 20% of the methuselah flies survive after 75 days, the probability of one fly’s survival is \( \frac{\mathrm{1} }{\mathrm{5} } \).
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