On Fri, 15 Mar 2024, Rich Shepard wrote:

Apparently so. Careful re-entering the ERT allowed the doc to compile.

I was wrong. I cannot get an simple equation to compile via the menus or
ERT.

I copied the real doc.lyx to mwe.lyx and deleted everything above and below
the paragraph with the equation. That non-printable character shows up even
with a minimal entry in the ERT, regardless of whether the backslash is
entered.

I'm totally lost and need advice on what might cause this issue.

mwe.lyx attached.

Rich
#LyX 2.3 created this file. For more info see http://www.lyx.org/
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\usepackage{mathpazo,amssymb}
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\usepackage{xcolor,colortbl}
\usepackage{chngcntr}
\usepackage{xurl}
\counterwithout{figure}{section}
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\lehead{CERCLA Data Analysis}
\rohead{CERCLA Data Analysis}
\refoot{Applied Ecosystem Services, LLC}
\lofoot{Applied Ecosystem Services, LLC}
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\begin_body

\begin_layout Standard
The arithmetic mean (or simply mean or average) of a list of numbers, is
 the sum of all of the numbers divided by the number of numbers.
 Similarly, the mean of a sample, 
\begin_inset ERT
status open

\begin_layout Plain Layout

$
\backslash
x_1,$
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, usually denoted by 
\begin_inset Formula $\bar{x}$
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, is the sum of the sampled values divided by the number of items in the
 sample.
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