Cant get mean of two variables in a data set. error code

I have followed exactly what my uni lecturer has done but the code wont work for me. I just want to get the mean score of a data set. Please help!!!

The ISR paclage youl loaded has a function named mean , which you are indavertently using in lieu of base::mean, therefore you can solve by being explicit and prefixing mean with base::

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Thank you! That worked

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