It is difficult to give a single definitive answer to "what is the percentage of placement overall lifetime?" as this depends on various factors and the specific context. Placement rates can fluctuate depending on the institution, the field of study, the time period, and how "placement" is defined (e.g., includes graduate studies, full-time employment, or both).

Here's a breakdown of what you need to consider:

Factors Influencing Placement Rates:

Institution Type:

IITs, NITs, and other premier engineering institutions typically have high placement rates, while other colleges and universities may have lower rates.

Field of Study:

STEM fields (Science, Technology, Engineering, Mathematics) generally have higher placement rates compared to humanities or social sciences.

Time Period:

Placement rates can fluctuate from year to year depending on the economic climate and the demand for graduates in specific fields.