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The problem i am facing is , since i use meter rule to measure length and for example i get a result of 115.65cm . After that , i want to convert it to meter , actually how many decimal places should i put in my laboratory report ? Someone tell me that i should put 3 or less decimal place but i think we can measure up to 0.0005m using a meter rule , so we should put 4 decimal places . Am i right ?

Besides , the result i need to use to calculate the average length . Then is it the average length is also use 4 decimal places ?

After that , we need to calculate the variance . How many decimal places should i put in the variace ?

After that , we square root the variance to get the standard deviation .Again how many decimal place should i put for the answer of standard deviation ?

Finally , we will calculate the standard error , What is the decimal places should i put for the standard error ?

And for the final answer , should i put (1.1565 +- standard error) m or otherwise ?

I know this is a simple question for physics but i still don't know even i am a undergraduate student now because for the secondary school , our education system don't enforce this rule , so no one use it.

So, somebody please answer my questions .Please.