100 firms profit range($m)are given as,10-15;16-21;22-27;28-33;34-39,40-45;46-51.find the variance?

The profit ranges (Nm) of 100 firms in a given industry are given as: 10-15; 16-21; 22-27; 28-33; 34-39; 40-45; 46-51. What is the profit variance?

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