Question
PSLE
The table shows the number of students with the following scores. A higher score means a better performance. Prizes were given to the top 13 students. Billy won a prize. What was the lowest he could have scored?

 Score  15  16  17 18  20  23 24 25
Students  3 13  14  9  4
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PSLE
The table shows the number of students with the following scores. A higher score means a better performance. Prizes were given to the top 13 students. Billy won a prize. What was the lowest he could have scored?

 Score  15  16  17 18  20  23 24 25
Students  3 13  14  9  4