# NCERT CLASS 11 STATISTICS BOOK

Contents:  NCERT Books For Class 11 Statistics PDF Download Class 11 Statistics NCERT BOOK Free NCERT Solutions Statistics Class 11 NCERT SOLUTIONS. NCERT Class 11 Statistics bestthing.infoad NCERT Chapters and Books in pdf format. Easy to print and read. Copies of these textbooks may be. Download complete books of Class XI NCERT, Statistics subject. Statistics for Economics Chapters. Introduction; Collection of Data; Organisation of Data.

For example, the production of rice depends on rainfall, method of cultivation, seeds, manure, soil fertility etc. Before collecting data, a suitable plan for their collection should be prepared.

Data collected in an unsystematic manner would lead to misleading conclusions. Sometimes, when actual measurement of figures is not possible in a particular field of inquiry, then method of estimation or approximation is applied. For example, if we say that there are 30 students in XI class of XYZ public school, the figure is percent accurate if we apply counting method. But, on the other hand, if we say that 20, people are watching the cricket match, this figure can be obtained only by estimation method i. But even this estimation must have a reasonable degree of accuracy to make sense. The purpose should be clearly defined.

## Class 11: Statistics: StatisticsforEconomics

Otherwise, collected data will be of no use. Suppose, we want to compare the performance of students at secondary level of National Institute of Open Schooling in one subject or more. We must specify the subjects and the year for which comparison is being carried out before collecting data. Importance of Statistics: a Statistics and the study of consumption: Every individual needs a certain number of things.

Miscellaneous ExerciseP. If six of the observations are 6, 7, 10, 12, 12 and 13, find the remaining two observations. Ans : Let the remaining two observations be x and y. Therefore, the observations are 6, 7, 10, 12, 12, 13, x, y.

If five of the observations are 2, 4, 10, 12, Find the remaining two observations. The observations are 2, 4, 10, 12, 14, x, y. If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations. On rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases: i If wrong item is omitted.

## NCERT Solutions for Class 11 Maths Chapter 15

Therefore, the highest variability in marks is in Chemistry and the lowest variability in marks is in Mathematics. Later on it was found that three observations were incorrect, which were recorded as 21, 21 and Find the mean and standard deviation if the incorrect observations are omitted. Ans : The following table is formed. Therefore, 20 - 30 is the median class. Therefore, it has to be converted into continuous frequency distribution by subtracting 0. The table is formed as follows. The class interval containing theor 50th item is Therefore, Ans : The data is obtained in tabular form as follows. Ans : Firstly, the standard deviation of group A is calculated as follows. Thus, group B has more variability in the marks.

## NCERT Solutions for Class 11 Maths Chapter 15

Thus, the prices of shares Y are more stable than the prices of shares X. Therefore, the firm with greater standard deviation will have more variability.

Thus, firm B has greater variability in the individual wages. Find which team may be considered more consistent?NCERT books are books that are not in the competitive market. It is way advanced than any other book in the market. 