Question
PSLE
The table shows the number of books read by each student in a class of 45 students. One of the numbers in the table is covered by an ink blot. The average number of books read by the students in the class is 4. What is the number covered by the ink blot?

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PSLE
The table shows the number of books read by each student in a class of 45 students. One of the numbers in the table is covered by an ink blot. The average number of books read by the students in the class is 4. What is the number covered by the ink blot?