To complete the two-way table for tracking attendance, we need to fill in the missing information:
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Total for Friday: We know that the total for Friday is 52.
- Attendance for 7th graders on Friday is 24.
- Thus, the attendance for 8th graders on Friday = Total for Friday - Attendance for 7th graders on Friday
- Attendance for 8th graders on Friday = 52 - 24 = 28.
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Total for Saturday: We know that the total for Saturday is the sum of the attendance of 7th and 8th graders, which we need to calculate.
- Attendance for 8th graders on Saturday is given as 35.
- We still need to find Attendance for 7th graders on Saturday = Total for Saturday - Attendance for 8th graders on Saturday.
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Combined Totals: We can now calculate the total attendance for both grades:
- Total attendance = Total for Friday + Total for Saturday
- We need to determine the missing total for Saturday, which hinges on determining the 7th graders present on Saturday.
So we calculate as follows:
- Totals:
- 7th Graders Total: 24 (Friday) + X (Saturday)
- 8th Graders Total: 28 (Friday) + 35 (Saturday) = 63
- Now we can fill in the attendance for Saturday by adding the totals.
Now we rewrite the completed table as follows before answering the question about total number of eighth graders:
| | Friday | Saturday | Totals | |---------------|--------|----------|--------| | 7th graders | 24 | X | X | | 8th graders | 28 | 35 | 63 | | Totals | 52 | X | X |
The total number of eighth graders = 63.
Therefore, the correct answer is 63.