行业不同，均值的意义也就不同。比如，完全竞争行业和垄断行业的均值可能较有意义，但是垄断竞争行业的均值就可能受到行业内极端值影响。

问问公司的总裁，让他来估算，因为他对公司的前景最了解

i think you are familiar with the so call growth share or value share. obviousely, companies with high growth rate, its capitalization can also growth in high rate (i.e. this kind of companies will always have more positive net present value projects). i think P/E AND P/B ratio will be helpful for you, cause high growth comanies will have higher p/e and p/b ratio, such as microsoft. other thing that you would find useful would be the company's balance sheet, cash flow statment, income statment. revenue,net income,debt to equity ratio and so on. Also,you can take macro economy climate into account. for example, at the moment, industry metal price is high, accordenly, mining companies will have higher net income, then grow in higher rate.

感觉还是用行业平均增长率

这个问题很普遍的做法，是从历史数据估算企业销售收入和总资产的函数关系，然后在此基础上，通过预测企业未来销售增长，推算总资产增长率。在财务计算中，所有要素其实都是销售收入的函数。