Calculate Karl Pearson's and Bowley's coefficient of skewness for the data given below.

\begin{tabular}{|l|l|l|l|l|l|l|l|}
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X & [tex]$50-55$[/tex] & [tex]$45-50$[/tex] & [tex]$40-45$[/tex] & [tex]$35-40$[/tex] & [tex]$30-35$[/tex] & [tex]$25-30$[/tex] & [tex]$20-25$[/tex] \\
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f & 25 & 30 & 40 & 45 & 80 & 110 & 170 \\
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\end{tabular}