You are estimating the contractor’s material handling cost as a factor of the material cost. After examining 6 previous contracts you have the percentage (factor) for each contract:

2.5% 6.2% 3.2% 12.9% 7.0% 15.3%

All of the following would be reasonable actions except for:
Consider if there is an additional cost driver
Determine if all 6 contracts were for similar work
Reconsider if material cost is a good indicator of material handling cost
Throw out the high and low values and average the remaining factors

Throw out the high and low values and average the remaining factors

You are estimating the contractor’s material handling cost as a factor of the material cost. After examining 6 previous contracts you have the percentage (factor) for each contract:

2.5% 6.2% 3.2% 12.9% 7.0% 15.3%

All of the following actions can be reasonable in estimating the contractor's material handling cost, except for one. Let's evaluate each action:

1. Consider if there is an additional cost driver: This is a reasonable action. It's important to determine if there are any other factors, apart from the material cost, that may influence the material handling cost. This can help refine the estimation process.

2. Determine if all 6 contracts were for similar work: This is also a reasonable action. It is crucial to ensure that the previous contracts being examined were for similar types of work. Different types of projects may have different material handling requirements, which can affect the estimation.

3. Reconsider if material cost is a good indicator of material handling cost: This is a reasonable action as well. Although material cost can be a good indicator of material handling cost in many cases, it's important to reassess if it holds true for these specific contracts. Factors such as complexity, size, and location of the projects may affect the material handling requirements differently.

4. Throw out the high and low values and average the remaining factors: This action is not reasonable. By throwing out the high and low values, the sample size decreases, and averaging the remaining factors may not accurately represent the entire range of data. It is generally preferred to use all available data points to calculate the estimate.

Therefore, the action that is not reasonable is "Throw out the high and low values and average the remaining factors."