Practice using variables and vectors to represent biological data in R. You will work with gene expression levels for a gene across multiple samples and perform a basic calculation.

• Assign the expression levels 5.2, 6.8, and 7.1 to geneA_sample1, geneA_sample2, and geneA_sample3, respectively.
• Combine these three variables into a vector called geneA_expression.
• Calculate the mean of geneA_expression and assign it to geneA_mean.
• The code must create variables, a vector, and calculate the mean as described.