Definitions [1]
A sequence, in which each of its terms can be obtained by multiplying or dividing its preceding term by a fixed quantity, is called a geometric progression.
- A fixed number is called the common ratio (r)
Formulae [1]
\[ \begin{array}{c} \text{The mean of statistical data} = \dfrac{\text{The sum of all scores}}{\text{Total no. of scores}} = \dfrac{\sum\limits_{i = 1}^{N} x_{i}}{N} \end{array} \]
(Here \[ x_{i} \] is the \[ i^{th} \] score)
Mean is denoted by \[ \overline{X} \] and it represents the average of the given data.
\[ \overline{X} = \frac{\sum\limits_{i = 1}^{N} x_{i}}{N} \]
Key Points
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Statistics deals with collecting, organising, analysing, and interpreting data.
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Central tendency gives a single representative value for a data set.
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Mean is the arithmetic average.
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Median is the middle value of ordered data.
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Mode is the most frequently occurring value.
Concepts [29]
- Number System (Entrance Exam)
- HCF and LCM (Entrance Exam)
- Average (Entrance Exam)
- Ratio and Proportion (Entrance Exam)
- Mixture and Allegations (Entrance Exam)
- Simplification (Entrance Exam)
- Algebra (Entrance Exam)
- Partnership (Entrance Exam)
- Percentage (Entrance Exam)
- Profit and Loss (Entrance Exam)
- Simple and Compound Interest (Entrance Exam)
- Time and Work (Entrance Exam)
- Pipes and Cisterns (Entrance Exam)
- Time, Speed and Distance (Entrance Exam)
- Boats and Streams (Entrance Exam)
- Problems Based on Ages (Entrance Exam)
- Geometry (Entrance Exam)
- Mensuration - Area and Volume (Entrance Exam)
- Data Interpretation (Entrance Exam)
- Simplification, Square, Square Root, Cube and Cube Root (Entrance Exam)
- Problems on Trains (Entrance Exam)
- Concepts of Statistics
- Algebraic Identities and Polynomials (Entrance Exam)
- Equations and Inequalities (Entrance Exam)
- Trigonometry (Entrance Exam)
- Concept of Probability
- Geometric Progression (G. P.)
- Fraction (Entrance Exam)
- Miscellaneous (Entrance Exam)
