Quantitative Aptitude – Number Sequences, Series, Averages, Number Systems

A sequence is a list of numbers written in a special order such as (1, 2, 3, 4…), which typically follows a pattern. Sequences are usually set in brackets ( ) to notate the sequence, and each element (also known as a “member” or “term”) of the sequence is separated by a comma, like this: … Read more

Mixed ratio and proportion

Mixed ratio and proportion Ratio Introduction: Ratio is the relation which one quantity bears to another of the same kind. The ratio of two quantities a and b is the fraction a/b and we write it as a: b. In the ratio a: b, we call a as the first term or antecedent and b, the second … Read more

Problems Based on Probability- Permutations and Combinations

Probability Probability is simply how likely something is to happen. Whenever we’re unsure about the outcome of an event, we can talk about the probabilities of certain outcomes—how likely they are. The analysis of events governed by probability is called statistics. Tossing a Coin When a coin is tossed, there are two possible outcomes: heads … Read more

Data Sufficiency in Statistics

Data Sufficiency in Statistics A sufficient statistic is a statistic that summarizes all of the information in a sample about a chosen parameter. For example, the sample mean, x̄, estimates the population mean, μ. x̄ is a sufficient statistic if it retains all of the information about the population mean that was contained in the … Read more

Pie Charts- Problems Based on Tabular and Diagrammatical Data

Pie-chart A pie graph (or pie chart) is a specialized graph used in statistics. The independent variable is plotted around a circle in either a clockwise direction or a counterclockwise direction.The dependent variable (usually a percentage) is rendered as an arc whose measure is proportional to the magnitude of the quantity.Each arc is depicted by … Read more

Data Collection Analysis- Interpretation- Collection, Interpretation and Appreciation of Statistical Data

Data interpretation Data Interpretation or DI refers to the implementation of procedures through which data is reviewed for the purpose of arriving at an inference. Data can be obtained from multiple sources e.g. data from running of industries, census population data etc. Interpreting data requires analyzing data to infer information from it in order to … Read more

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