Hi there, I have attached a graph and would like to ask how do I calculate the Signal to noise ratio as well as the standard deviation from these graphs thx

 

You forgot the graph.

 

ops sry haha

 

Hi there, I have attached a graph and would like to ask how do I calculate the Signal to noise ratio as well as the standard deviation from these graphs thx

To compute the standard deviation

1. Compute the mean(average)
2. Tabulate the deviations between the samples and the mean
3. Square the deviations
4. Divide by the number of samples to get the average squared deviation.
5. Take the square root of the average squared deviation

This would be the population standard deviation. There is a very small correction if you use a sample to estimate the sd of a population.