NCERT Exemplar for Class 10, Maths Chapter 13

NCERT Exemplar Class 10 Maths Chapter 13: Statistics and Probability. NCERT Exemplar Solutions for Class 10 Maths Chapter 13 Statistics and Probability prepare students for their Class 10 exams thoroughly.

Maths problems and solutions for the Class 10 pdf are provided here which are similar to the questions being asked in the previous year’s board.

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1 NCERT Exemplar Class 10 Maths Chapter 13: Statistics and Probability
2 Answers

NCERT Exemplar Class 10 Maths Chapter 13: Statistics and Probability

Class 10 : Maths Chapter 13 solutions. Complete Class 10 Maths Chapter 13 Notes.

Main Concepts & Results
Statistics: Measures of Central Tendency
(a) Mean of Grouped Data
(i) To find the mean of grouped data, it is assumed that the frequency of each class interval is centred around its mid-point.
(ii) Direct Method

(iii) Assumed Mean Method

(iv) Step-deviation Method

(v) If the class sizes are unequal, the formula in (iv) can still be applied by
taking h to be a suitable divisor of all the .
(b) Mode of Grouped Data
(i) In a grouped frequency distribution, it is not possible to determine the mode by looking at the frequencies. To find the mode of grouped data, locate the class with the maximum frequency. This class is known as the modal class. The mode of the data is a value inside the modal class.
(ii) Mode of the grouped data can be calculated by using the formula

(c) Median of Grouped Data
(i) Cumulative frequency table – the less than type and the more than type of the grouped frequency distribution.
(ii) If n is the total number of observations, locate the class whose cumulative frequency is greater than (and nearest to) This class is called the median class.
(iii) Median of the grouped data can be calculated by using the formula:

where l is the lower limit of the median class, n is the number of observations, h is the class size, cf is the cumulative frequency of the class preceding the median class and f is the frequency of the median class.
(d) Graphical Representation of Cumulative Frequency Distribution (Ogive) – Less than type and more than type.
(i) To find median from the graph of cumulative frequency distribution (less than type) of a grouped data.
(ii) To find median from the graphs of cumulative frequency distributions (of less than type and more than type) as the abscissa of the point of intersection of the graphs.
Probability