[Tex/LaTex] table in LaTeX giving error

tablestabularx

I'm trying to create the table using the below script and its giving this error 

"! Missing $ inserted.<inserted text> $ l.689 \end{tabularx}" 

\begin{table*}[t]
\centering\setlength{\tabcolsep}{.3\tabcolsep}
\begin{tabularx}{\linewidth}{|*2{>{\centering\hsize=1.6666\hsize}X|}*8{>{\centering\arraybackslash\hsize=.83333\hsize}X|}}
\hline
{\bf Point of Comparison} & {\bf X} & {\bf Y} & {\bf Z} & {\bf Average_entropy} & {\bf TC & {\bf RT}\\

\hline
\end{tabularx}
\caption{specs}
\label{tab:template}
\end{table*}

Best Answer

Is this what you seek? How many columns do you have? 7 or 10. I do 10 in the final output. For 7 columns, you need to redo the \hsize calculation. The missing dollar sign error is due to this Average_entropy. I have changed it to a single dash.

enter image description here

Code

\documentclass[]{article}
\usepackage[margin=1cm]{geometry}
\usepackage{tabularx}

\begin{document}
\begin{table*}[t]
\centering\setlength{\tabcolsep}{.3\tabcolsep}
\begin{tabularx}{\linewidth}{|*2{>{\centering\hsize=1.6666\hsize}X|}*8{>{\centering\arraybackslash\hsize=.83333\hsize}X|}}
\hline\hline
{\bf Point of Comparison} & {\bf X} & {\bf Y} & {\bf Z} & {\bf Average-entropy} & {\bf TC} & {\bf RT} &&&\\
\hline
\end{tabularx}
\caption{specs}
\label{tab:template}
\end{table*}
\end{document}
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