Extract the subset of rows of the data frame where Ozone values are above 31 and Temp values are above 90. What is the mean of Solar.R in this subset?

Google search: “R subset values in one column above threshold”

This was a very helpful link:

[1] http://www.ats.ucla.edu/stat/r/faq/subset_R.htm

This arrived at the correct answer:

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