documentclass{article}
usepackage{graphicx}
begin{document}
An Excel spreadsheet has been saved as textbf{dataandgraph.xlsx}.
Now to get the data and the graphics into a PDF using LaTeX{}.
section{Copy and Paste Methods}
This approach is only useful for one-time graphics inclusions
into LaTeX.  And you are very, very sure that there will be
no editing or changes of the graphics.  (This is rarely true
for Excel graphics.)
subsection{Copy graphic, paste to PowerPoint, Save as *.png}
This is quick and fairly easy to do.  It is expecially useful
if your workflow requires LaTeX{} for the paper and PowerPoint
for the presentations.

includegraphics[width=.45linewidth]{copypastetopptsaveaspng}
subsection{Copy Data Table, paste to PowerPoint, Save as *.png}
This is quick and fairly easy to do.  It is expecially useful
if your workflow requires LaTeX{} for the paper, Excel for
data collection, and PowerPoint for the presentations.

includegraphics[width=.45linewidth]{CopyDataToPPTsaveAspng}

section{Using the textbf{R package xlsx} to read the
textit{*.xlsx} file and Knitr to move to LaTeX{}}
verb+http://www.sthda.com/english/wiki/+ \
verb+r-xlsx-package-a-quick-start-guide-to-manipulate-excel-files-in-r+.

Note: there is also a package textbf{openxlsx}  which offers
more control on writing and reading of xlsx files from R.
subsection{Using R to move the data table to LaTeX{}}
This requires that the computer has R installed with the
needed R packages.  And that the user knows how to integrate
the knitr and LaTeX{} compile process.
verb+http://yihui.name/knitr/+
<<>>=
library(xlsx)
tt<- data.frame(read.xlsx('dataandgraph.xlsx',1))
str(tt)
tt
@
Using the Excel data to plot a graph.
<<out.width='3in'>>=
attach(tt)
plot(a,b)
@

Now the data output can be made to use LaTeX{} fonts
by xtable.  Note: In the R-chunk all code output has
been turned off.

<<echo=FALSE,results='asis'>>=
library(xtable)
tt<- data.frame(read.xlsx('dataandgraph.xlsx',1))
xtable(tt)
@

end{document}