Making inferences from random samples

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Problem

Jordan Michael runs a basketball camp. A group of randomly selected camp participants were asked to give their shirt size. The table below shows the results of the survey. There are 308 camp participants this year.
Shirt sizeNumber of participants
Small6
Medium15
Large23
Extra large12
Double extra large4
Based on the data, what is the most reasonable estimate for the number of this year's camp participants who will need a medium shirt?