The scores (out of 100) obtained by 30 students in a mathematics test are as follows: 69 , 48 , 84 , 59 , 46 , 71 , 81 , 47 , 65 , 56 , 83 , 83 , 66 , 64 , 71 , 60 , 66 , 68 , 69 , 66 , 83 , 76 , 69 , 71 , 81 , 71 , 73 , 50 , 71 , 66 .
Represent this data in the form of a continuous grouped distribution table ,taking class width as 10 and one of the class interval as 70 -80 .
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