Question 1118768
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Assuming a linear relationship between the percent chance for rain and the number of attendees,  the number is 20% of the way from 70 (0% chance) to 25 (100% chance).<br>
{{{.20(70-25) = .2(45) = 9}}}
{{{70-9 = 61}}}<br>
The expected number of people with a 20% chance of rain would be 61.