Question

the mean of 6 number is 30 if one number is excluded the mean is 29 find the excluded number​

Answer 1

Answer:

Accordingly,

    (x₁ + x₂ + x₃ + x₄ + x₅ + x₆)/6 = 30

⇒ (x₁ + x₂ + x₃ + x₄ + x₅ + x₆) = 180

Again,

    (x₁ + x₂ + x₃ + x₄ + x₅)/5 = 29   [Let, the excluded number be x₆]

⇒ (x₁ + x₂ + x₃ + x₄ + x₅) = 145

    ∴ (x₁ + x₂ + x₃ + x₄ + x₅ + x₆) =   180

     - (x₁ + x₂ + x₃ + x₄ + x₅)        = - 145

     ------------------------------------------------

    ∴ x₆ = 35

Ans - The excluded number is 35.

                                                           

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