（75） involves comparing actual or planned project practices to those of other projects to generate ideas for improvement and to provide a basis by which to measure performance. These other projects can be within the performing organization or outside of it, and can be within the same or in another application area.

A．Metrics

B．Measurement

C．Benchmarking

D．Baseline

关于组距、组中值和组限之间的关系，下列公式表示正确的是（）。

A．组限=组中值÷2

B．组中值=(上限+下限)÷2

C．组中值=(上限-下限)÷2

D．组距=(上限-下限)÷2