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9. The following data shows the marks obtained by 5 students in Algebra and Trigonometry. s slugmoD III dong oniwollon Algebra Trigonometry 15 18 ST

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9. The following data shows the marks obtained by 5 students in Algebra and Trigonometry. s slugmoD III dong oniwollon Algebra Trigonometry 15 18 ST .8 ude svil yd b eaim esxxivo eelM 10 19 16 esons edA 10 19dm 11 12 10 10 20 8 17 X Y XY X2 Y2 EX = EY = EXY = EX2 = EY? = n EXY- EX . EY YX3 r= In EX2 - (EX) 2] [n EY2 - ([Y) 2]

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