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ch6sometechniquesofcalculation-2.studentview

# M of the example salaries employees of company c are

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Unformatted text preview: µ i =1 N i N Y ) = ∑ (a + bxi − a − bµ X ) = b 2 2 i =1 2 2 N 2 ∑ (x − µ i =1 i N X )2 ∑y i N N ∴ µ Y = a + bµ X = a+b ∑x i =1 N ∑(y − µ i =1 N i i =1 i Y) =b ∑ (x − µ i =1 i N i =1 i N )2 X X i ∑(y − µ Y ) 2 N 2 2 σ Y = b 2σ X = b2 ∑ (x − µ N )2 Example 6: Salaries (in \$1000 p.m.) of the Example Salaries employees of Company C are given below: employees Salary x Frequency f 5.5 6.5 8.0 20 25 5 total 50 (a) Find the mean and standard deviation of X. (b) If everyone’s salary is revised 6% up, find the (b) new mean and s.d. new (c) If everyone is further given a travel allowance (c) of \$400, find the new mean and s.d. of So...
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