Card 178 / 180: XYZ, Inc. manufactures a certain type of metallic bar with tensile strength of 85 kilograms. Several of its customers have complained about deterioration in average tensile strength of bars that were recently purchased. As part of an investigation to check the validity of these complaints, an engineer has performed destructive testing on 34 samples providing an average of 84 kilograms and a sample standard deviation of 3.8 kilograms. To evaluate whether or not the customer concerns are valid, what is the point estimate of mean tensile strength in the population?
A) 84 kilograms
B) 85 kilograms
C) 88.8 kilograms
D) 87.8 kilograms

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