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The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is:
If the mean of the observations: x, x + 3, x + 5, x + 7, x + 10 is 9, the mean of the last three observations is
If x̄ represents the mean of n observations x₁, x₂, ..., xₙ, then value of Σ(xᵢ - x̄) from i=1 to n is:
If each observation of the data is increased by 5, then their mean
Let x̄ be the mean of x₁, x₂, ... , xₙ and ȳ the mean of y₁, y₂, ... , yₙ. If z̄ is the mean of x₁, x₂, ... , xₙ, y₁, y₂, ... , yₙ, then z̄ is equal to
If x̄ is the mean of x₁, x₂, ... , xₙ, then for a ≠ 0, the mean of ax₁, ax₂, ..., axₙ, x₁/a, x₂/a, ... , xₙ/a is
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