Six Sigma Lean Black Belt Certification Questions Part 1

A Belt working in a supply chain environment has to make a decision to change suppliers of critical raw materials for a new product upgrade. The purchasing manager is depending on the Belt’s effort requiring that the average cost of an internal critical raw material component be less than or equal to $\mathrm{\$}$3,600 in order to stay within budget. Using a sample of 42 first article components, a Mean of the new product upgrade price of $\mathrm{\$}$3,200 and a Standard Deviation of $\mathrm{\$}$180 wasestimated. Based on the data provided, the Z value for the data assuming a Normal Distribution is?