Statistics
Subject matter experts of JagranJosh have developed a chapter wise practice sets as per the relevancy of the chapter in the board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Statistics” of Mathematics.

Q1.$$In\text{}the\text{}formula\overline{x}=a+\frac{{\displaystyle \sum {f}_{i}}{d}_{i}}{{\displaystyle \sum {f}_{i}}},\text{}for\text{}finding\text{}the\text{}mean\text{}of\text{}grouped\text{}data\text{}{d}_{i}\u2019s\text{}are\text{}deviations\text{}from\text{}the:$$
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Q2.While computing mean of the grouped data, we assume that the frequencies are:
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Q3.$$\begin{array}{l}If\text{}{x}_{i}\u2019s\text{}are\text{}the\text{}midpoints\text{}of\text{}the\text{}class\text{}intervals\text{}of\text{}grouped\text{}data,\text{}{f}_{i}\u2019s\text{}are\text{}the\text{}corresponding\text{}frequencies\text{}and\text{}\overline{x}\text{}is\text{}the\\ mean\text{},\text{}then{\displaystyle \sum \left({f}_{i}{x}_{i}\overline{x}\right)}\text{}is\text{}equal\end{array}$$
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Q4.The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency of a grouped data gives its:
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Q5.For the following distribution,
The sum of lower limits of median class and modal class is:Show Solution Report ErrorPlease Login here to view detailed solution of this question
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Q6.If the arithmetic mean of x, x+3, x+6, x+9 and x+12 is 10, then x = ?
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Q7.If the mean of first n natural numbers is 5n/9 , then n =?
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