Sample variance and sample standard deviation calculation

#78. Consider a sample x1, x2, …, xn and suppose that the values of x, s2, and s have been calculated.
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a. Let yi = xi – x for i = 1, …, n. How do the values of s2 and s for the yi’s compare to the corresponding values for the xi’s? Explain.
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b. Let zi = (xi – x ) / s for i = 1, …, n. What are the values of the sample varianceand sample standard deviationfor the zi’s?

Please see attached.