SAMPLE MEAN OF VARIABLE X IS CALCULATION AS Select one: bar (x)=sum _(i=1)^bar (k)n_(i)x_(i) bar (x)=(1)/(n)sum _(i=1)^bar (k)x_(i) O bar (x)=(1)/(n)sum _(i=1)^nn_(i)x_(i) O bar (x)=(1)/(k)sum _(i=1)^bar (k)n_(i)x_(i) bar (x)=(1)/(n)sum _(i=1)^bar (k)n_(i)x_(i)

The correct answer is: Explanation: The sample mean of a variable X is calculated by taking the sum of all the values of X and dividing it by the total number of values. In the given options, the correct formula for calculating the sample mean is , where n is the total number of values and represents the number of groups or categories.