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Dubai

Note On Statistics

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Published in: Mathematics
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Statistics formulas note

Faisal A / Abu Dhabi

7 years of teaching experience

Qualification: BSc in Electrical and Electronics Engineering

Teaches: Photography, English, Science, Maths

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  1. Key Notes Chapter 14 Statistics 1. Collection of Data 2. Presentation of Data 3. Graphical Representation of Data 4. Measures of Central Tendency • • • • • • • • Statistics is the area of study that deals with the collection presentation, analysis and interpretation of data. Data: Facts or figures, collected with a definite purpose, are called data. There are two types of data (i) Primary (ii) Secondary We can represent the data by (i) ungrouped and grouped frequency distribution. Data can also represent by (i) bar graph (ii) Histogram (iii) Frequency polygons Class mark of grouped data is 2 Measure of central tendencies by mean, median, mode. sum of all observations Mean: (x) = Total no. of observations If observations denoted by and their occurrence i.e. frequency is denoted by then mean is Efixi Efi Median: Arrange the observations in ascending or descending order then if numbers of observations (n) are odd then then median is term. 2 If no. of observations (n) are even, then median is average of Mode: The observation whose frequency is greatest. Mode = 3 median - 2 mean. . and — + . 2 terms.

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