ch6sometechniquesofcalculation-2.studentview

7 dt 24 dt 67 58 dt shift 58 88 data set 1 data set 2

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Unformatted text preview: −µ Z x ∑ = 2 i +∑ i2 y 9 964 +2925 − 2= 20 − 400 9 ∴ z =5.6667.......(6) σ 3889 − 400 9 σ2 =32.1111 Z σ2 = Z Example 5: Example Find µ and Find σ for the 17 numbers mixed together. Solution: ON MODE COMP MODE SD SD 6.7 DT 2.4 DT 6.7 - 5.8 DT SHIFT 5.8 88+ Data Set 1 Data Set 2 N = 13 6.7 , 2.4 µ =8 -5.8 3 3 9.7 DT 9.7 σ 2 =14 Set 2 should be viewed as Set the this table: the x 8 − 14 8 + 14 14 SHIFT ; 6.5 DT 14 SHIFT ; 6.5 DT n EXE 17 = N SHIFT S-SUM f 6.5 6.5 13 SHIFT S-VAR x EXE 6.4372 = µ SHIFT S-VAR xσn EXE 4.841 = σ ∴ µ = 6.4372, σ = 4.8410 Simple Exercises: Simple 1. Create 10 numbers so that mean=143 and s.d.=15 2. Data set 1: Data set 2:...
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