To construct the two-way table and determine the total number of 8th graders, we need to fill in the missing entries based on the information given.
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We know that the total attendance on Friday is 52.
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There are 24 7th graders on Friday, so we can find the number of 8th graders on Friday:
\[ \text{8th graders on Friday} = \text{Total on Friday} - \text{7th graders on Friday} \] \[ \text{8th graders on Friday} = 52 - 24 = 28 \]
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Now we can fill in the number of 8th graders on Saturday, which is given as 35.
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Now let's calculate the total number of 8th graders:
\[ \text{Total 8th graders} = \text{8th graders on Friday} + \text{8th graders on Saturday} \] \[ \text{Total 8th graders} = 28 + 35 = 63 \]
Thus, the total number of 8th graders is 63.