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 frequency from the lowest class to highest class are 6, 17, 35, 48, 65, 90, 131, 173, 155, 117, 75, 52, 21, 9 and 6. find mean?
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I can't understand this sorry
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