What inference can Mr. Rodriguez draw from Sandra's IQ score of a Z-score of 0?

A Z-score indicates how many standard deviations a data point is from the mean of a set of data. In the context of IQ scores, a Z-score of 0 means that Sandra's score is precisely at the average level when compared to her peers. Since the mean of IQ scores is typically set at 100, her score would align with this average.

This is significant because it reflects that she possesses cognitive abilities consistent with the typical range of intellectual functioning, which usually encompasses those scoring between approximately 85 and 115 on standard IQ tests. Thus, a Z-score of 0 accurately infers that Sandra's intelligence level falls into the average range, indicating no deviation towards being either below or above average.