I would like to know how to do the following commands on R:
1) Choose 20 random numbers modelled on the normal distribution.
2)Any of these numbers that are negative to change them to ZERO.
3)Perform a command that will enable me to find the maximum likelihood (the 
true mean of the distribution). If any of the numbers are zero i need to know 
which ones they were if possible.

Thank you very much for your. I look forward to hearing from you.

Yours Sincerely,

James Hutton

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