Frequency Tables

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Mathematics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

List each distinct value once and record how often it appears. The word frequency just means count.

Each group is a class; its size is the class width. Classes must not overlap and must cover every value.

Multiply each midpoint by its frequency, add these, then divide by total frequency. It is an estimate because exact values are unknown.

Each cumulative value counts everything at or below that class's upper boundary. The halfway point gives the estimated median.

frequency	the number of times a value or event occurs in a data set
class interval	a range of values grouped together in a frequency table
class width	the size of a class, found by subtracting lower bound from upper bound
modal class	the class interval with the highest frequency
midpoint	the value halfway between a class's lower and upper bounds
cumulative frequency	a running total of frequencies up to and including each class
median	the middle value when data is ordered; the halfway point of the cumulative frequency
interpolation	estimating a value inside a class using its position within the class width

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