Question: please modify the findMode method to return null if there are multiple modes in the array list. Also add a standard deviation method along with

please modify the findMode method to return null if there are multiple modes in the array list. Also add a standard deviation method

please modify the findMode method to return null if there are multiple modes in the array list. Also add a standard deviation method along with the mean median and mode methods already provided and modify the tester class accordingly.

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