A market researcher analyzes how many electronics devices customers buy in a single purchase. The distribution has a mean of three with a standard deviation of 0.7. She samples 400 customers. What is the z-score for Σx = 1,172? (Enter an exact number as an integer, fraction, or decimal.) B. An unknown distribution has a mean of 100, a standard deviation of 100, and a sample size of 100. Let X = one object of interest. What is the mean of ΣX? (Enter an exact number as an integer, fraction, or decimal.)

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