The wages of 1000 employees range from Rs. 4.50 to Rs. 19.50. They are grouped in 15 classes with a common class interval of Rs. 1, and the class frequencies from the lower class to the highest class are: 6, 17, 35, 48, 65, 90, 131, 173, 155, 117, 75, 52, 21, 9 and 6. Find the mean wage , standard deviation and variance, Also interpret your results.

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