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LadyCiel
The mean of the first 12 measurements is 8.5 units, which is the average.
Then the second 20 measurements have an average of 7.5 units.
To find the mean (or the average) you add all measurements and then divide the sum by the number of measurements.
So you will do 12 times 8.5 plus 20 times 7.5 and divide it all by 32.
You get 102+150 which is 252 and divide it by 32, which is 7.875. 
The mean of all 32 measurements is 7.875 units.
I hope this is helpful, but if you have any other questions, feel free to comment below.

The mean of all 32 measurements from the given parameters is; 7.875

How to find the Mean Average?

We are told that;

A sample of 12 measurements has a mean of 8.5. Thus;

Total of 12 measurements = 12 * 8.5 = 102

A sample of 20 measurements has a mean of 7.5. Thus;

Total of 20 measurements = 20 × 7.5 = 150

Total of two samples = 102 + 150 = 252

Number in 2 samples = 32

Thus;

Mean of all 32 measurements = 252/32 = 7.875

Read more about Mean Average at; https://brainly.com/question/20118982

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