Correct Option: C (90%) Detailed Explanation: To determine the success rate of students in the WASSCE (West African Senior School Certificate Examination) as announced by the school, we need to understand what the success rate represents. The success rate is typically calculated as the percentage of students who passed the examination out of the total number of students who sat for it.

1. Understanding Success Rate:
2. The success rate is calculated using the formula: [ \text{Success Rate} = \left( \frac{\text{Number of Students Passed}}{\text{Total Number of Students}} \right) \times 100 ]
3. For example, if 90 out of 100 students passed, the success rate would be: [ \text{Success Rate} = \left( \frac{90}{100} \right) \times 100 = 90\% ]
4. Analyzing the Options:
5. The options provided are:
   • A. 80%
   • B. 85%
   • C. 90%
   • D. 95%
6. The correct answer is C (90%), which indicates that a significant majority of students were successful in their examinations.
7. Why Option C is Correct:
8. The announcement of a 90% success rate suggests that the school performed exceptionally well in preparing its students for the WASSCE. This high percentage reflects effective teaching methods, student dedication, and possibly good resources provided by the school.
9. Why Other Options are Incorrect:
10. Option A (80%): This would imply that only 80 out of 100 students passed. While this is a decent success rate, it does not reflect the high achievement level indicated by the school’s announcement.
11. Option B (85%): Similar to option A, an 85% success rate is commendable but still lower than the reported 90%. It suggests that more students struggled than what was actually the case.
12. Option D (95%): This option suggests an almost perfect success rate. While it is possible for a school to achieve this, it is less likely and would typically be highlighted as a significant achievement. The announcement of 90% indicates a strong performance without overstating the success.

Common Pitfalls:

• Misinterpretation of Success Rates: Students often confuse the success rate with the overall performance of the school. A high success rate does not necessarily mean that all students excelled; it simply indicates that a majority passed.
• Assuming Higher is Always Better: While a higher success rate is generally better, it’s important to consider the context. A school with a 90% success rate may have a more challenging curriculum than one with a 95% rate, which could indicate easier exams or less rigorous standards.

Revision Summary:

• The success rate is calculated as the percentage of students who passed the exam.
• The correct success rate for the WASSCE as announced by the school is 90% (Option C).
• Other options (80%, 85%, 95%) do not accurately reflect the reported success rate.
• Understanding the context of success rates is crucial for interpreting educational performance.