Question
Bahasa Melayu
Jadual kekerapan menunjukkan markah ujian 20 orang murid. Markah 1-5: kekerapan 2; Markah 6-10: kekerapan 5; Markah 11-15: kekerapan 8; Markah 16-20: kekerapan 5. Min markah ialah 12. Cari varians bagi markah itu.
English
The frequency table shows the test marks of 20 students. Marks 1-5: frequency 2; Marks 6-10: frequency 5; Marks 11-15: frequency 8; Marks 16-20: frequency 5. The mean mark is 12. Find the variance of the marks.
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