A data has highest value 120 and lowest value 71. A P frequency dis...

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A data has highest value 120 and lowest value 71. A
P frequency distribution in descending order with

W seven classes is to be constructed. The limits of the second classes-interval shall be
(1) 71 and 78
(2) 78 and 85
(3) 113 and 120
(4) 106 and 113
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