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The pulse rate of 30 person was recorded as given below
61 , 76 , 72 , 73 , 71 , 66 , 78 , 73 , 68 , 81 , 78 , 63 , 72 , 75 , 80 , 68 , 75 , 62, 71 , 81 , 73 , 60 , 79 , 72 , 73 , 74 , 71 , 64 , 76 , 71
construct a frequency table using class intervals of equal widht , one class interval being 60 - 65
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