The envelopes of letters received by an office one morning were measured.
The widths (in centimetres) were as follows:
\begin{tabular}{ccccc}
11.8 & 10.3 & 20.5 & 15.4 & 19.2 \\
15.0 & 20.7 & 12.8 & 9.7 & 18.9 \\
21.4 & 6.1 & 15.9 & 12.2 & 20.6 \\
7.9 & 15.0 & 11.3 & 10.0 & 16.1
\end{tabular}
\begin{tabular}{|c|c|c|}
\hline Width & Tally & Frequency \\
\hline & & \\
\hline & & \\
\hline & & \\
\hline & & \\
\hline
\end{tabular}
Click the tally column to tally off the data and complete the frequency table.
(You can click the numbers above as you tally them to cross them off.)
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