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81. What is the mid-value of a class is called the

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82. The number of times an obsen'ation occurs in the given data is called

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83. The class mark of the class 25–30 is

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84. The lower limit of the class 3.5–10.5 is

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85. The range of the data: 5, 15, 25, 18, 4, 6. 16, 20. 14 is

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86. What is the class size of 25-35?

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87. What is the probability of getting a head, when a coin is tossed?

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