1.

Absentee record ofrecord of students isgiven below. If mean is15.5, then the missing frequencies x &y are,No of day. total No of day0 to 5. 155 to 10. 1610to 15. X15to 20. 820to 25. y25 to 30. 830to 35. 635to 40. 4 _____________. ______Total. =70​

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