Final answer:
A common value for MSL in statistical contexts is generally below 26 minutes, as only 5% of samples would have means exceeding this mark. Without additional context, a more precise range cannot be definitively provided.
Step-by-step explanation:
In the context of sample means and common values in statistics, the student's question appears to concern the typical range for the mean of a sample data set, often referred to as the Mean Service Level (MSL). However, the question is phrased in a somewhat ambiguous fashion, making it difficult to provide a precise range without further context. Nonetheless, based on the provided information that 95 percent of such samples would have means under 26 minutes, it is reasonable to infer that a common value for MSL is likely to be less than 26 minutes, as only five percent would exceed this threshold.