The following are the drying times (minutes) of 100 sheets coated with polyurethane under various ambient conditions:

Construct a frequency distribution of these data, using eight classes.

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45.6 50.3 55.1 63.0 58.2 65.5 51.1 574 60.4 54.9 56.1 62.1 43.5 63.8 64.9 59.9 63.0 67.7 53.8 57.9 618 52.2 61.2 51.6 58.6 738 53.9 64.1 57.2 75.4 55.9 70.1 46.2 63.6 56.0 48.1 62.2 588 508 68.1 514 73.9 66.7 42.9 71.0 56.1 60.8 58.6 70.6 62.2 59.9 47.5 72.5 62.0 56.8 54.3 61.0 66.3 52.6 63.5 64.3 63.6 53.5 55.1 628 633 64.7 54.9 54.4 69.6 64.2 59.3 60.6 57.1 68.3 46.7 73.7 56.8 62.9 58.4 68.5 68.9 62.1 62.8 74.4 43.8 40.0 64.4 508 49.9 55.8 668 67.0 64.8 57.6 68.3 42.5 64.4 48.3 56.5