9. The relative strengths of 150 silver solder welds are tested, and the results are given in the following table.

Tally these figures and arrange them in a frequency distribution. Determine the cell interval and the approximate number of cells. Make a table showing cell midpoints, cell boundaries, and observed frequencies.

Plot a frequency histogram.

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1.5 1.2 3.1 1.3 0.7 1.3 0.1 2.9 1.0 1.3 2.6 1.7 0.3 0.7 2.4 1.5 0.7 2.1 3.5 1.1 0.7 0.5 1.6 1.4 1.7 3.2 3.0 1.7 2.8 2.2 1.8 2.3 3.3 3.1 3.3 2.9 2.2 1.2 1.3 1.4 2.3 2.5 3.1 2.1 3.5 1.4 2.8 2.8 1.5 1.9 2.0 3.0 0.9 3.1 1.9 1.7 1.5 3.0 2.6 1.0 2.9 1.8 1.4 1.4 3.3 2.4 1.8 2.1 1.6 0.9 2.1 1.5 0.9 2.9 2.5 1.6 1.2 2.4 3.4 1.3 1.7 2.6 1.1 0.8 1.0 1.5 2.2 3.0 2.0 1.8 2.9 2.5 2.0 3.0 1.5 1.3 2.2 1.0 1.7 3.1 2.7 2.3 0.6 2.0 1.4 3.3 2.2 2.9 1.6 2.3 3.3 2.0 1.6 2.7 1.9 2.1 3.4 1.5 0.8 2.2 1.8 2.4 1.2 3.7 1.3 2.1 2.9 3.0 2.1 1.8 1.1 1.4 2.8 1.8 1.8 2.4 2.3 2.2 2.1 1.2 1.4 1.6 2.4 2.1 2.0 1.1 3.8 1.3 1.3 1.0