Brain teasing statistics question

[primerick]

The n is all the values with 15, the mean is the middle values and the std. Dev is values at the end like 3.7733

 

[primerick]

Is there anyone who knows what to do with this?

 

[Deleted member 4993]

View attachment 27989

The n is all the values with 15, the mean is the middle values and the std. Dev is values at the end like 3.7733

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