ch6sometechniquesofcalculation-2.studentview

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Unformatted text preview: lution: Solution (a) By use of SD-MODE, 5.5 SHIFT ; 20 DT 6.5 SHIFT ; 25 DT 8 SHIFT ; 5 DT we can easily obtain N X = 50, µ X = 6.25, σ X = 0.75 (b) By (1) (b) by (2) by yi = 0 + 1.06 xi µY = 0 + 1.06 µ X = 1.06 × 6.25 = 6.625 2 2 σ Y = 1.06 2 σ X σ Y =| 1.06 | ×σ X = 1.06 × 0.75 = 0.795 by (4) (c) Now wi = 0.4 + yi µW = 0.4 + µY = 0.4 + 6.625 = 7.025 2 2 σW = σY σ W = σ Y = 0.795 Example 7: The pass mark of an examination is 50. The table below shows the marks (X) of 250 students who took the examination. The examiner revised the marks by the formula given by Y. given Mark X No. of Mean students 200 50 70 40 SD 8 6 Revised mark Y 4 y = 60 + ( x − 50) 5 11...
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This note was uploaded on 04/22/2011 for the course STAT 301 taught by Professor Gabrille during the Spring '11 term at HKU.

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