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Syllabus

What is assumed mean &how can we find it

how to use log & antilogtable to find square roots

Later on it was found that three observation were incorrect which were recorded as 21,21 and 18 find the mean and standard deviation if the incorrect observation are omitted

Couldn't understand how to find out correct standard deviation... Plzz help

What is the difference between mean deviation and standard deviation?

find dy/dx if y =(sec x+tanx )/(secx-tanx)

Find the mean deviation from the mean and standard deviation of the series:

a, a+d, a+2d, ....., (a+nd), .... a+(2n-1)d, a+2nd

its urgent..

Find the mean and variance of the first n even natural numbers

When do we use step-deviation method.Please explain the method.

Statement I: The mean salary would remain the same.

Statement II: The median salary would remain the same.

the mean and standard deviation of 100 observations were calculated as 40 and 5.1 resp. by a student who took by mistake 50 instead of 40 for one observation. what are correct mean and standard deviation?

What is discrete frequency distribution? And what is continuous frequency distribution?.

the mean of 5 observations is 4.4 and their variance is 8.24.if three of the observations are 1,2,6 .,find the other two observations.....

what is central tendency ????

what is the meaning of discrete frequency distribution ?Why is the sum of observations divided by TOTAL NUMBER OF OBSERVATIONS ??!! I know it is a formula...but i need a logical answer!

The variance of 15 observations is 4.If each observation is increased by 9,find the variance of the resulting observations?

please give a detailed expalanation

I can`t understand example 2 plz. explain it i have my maths exam on Friday.

The variance of 10 observations is 4. If each observation is multiplied by 3, find the variance of the new data?let x

_{1}, x_{2}, x_{3},....... x_{n }be n values of a variable X. If these values are changed to x_{1}+a, x_{2}+a,.... x_{n}+a, where a belongs to R, show that the variance remains unchanged.The mean and variance of 7 observations are 8 and 16, respectively. If five of the observations are 2, 4, 10, 12 and 14. Find the remaining two observations.

how to find assumed mean in statistics

Hint.Construct the following table :how to calculate assumed mean ?

how come the assumed mean 10 in the 1st video of variance and step deviation?

57, 64, 43, 67, 49, 59, 44, 47, 61, 59

Define Mean and Median,and also the Difference..

Arni bought a piece of timber that is 280 cm long.He wants to cut it into two pieces, Shorter piece needs to be 75% of the length of the longer piece.How long will the shorter piece be?

experts please answer fast its really very important.....

find the variance for the first 25 natural numbers

17. From a frequency distribution consisting of 18 observations, the mean and the standard deviation were found to be 7 and 4 respectively. But on comparison with the original data, it was found that a figure 12 was miscopied as 21 in calculations. Calculate the correct mean and standard deviation.

what is

method ?assume meanwhre iz d video???????????

Classes- 30-40 40-50 50-60 60-70 70-80 80-90 90-100

frequency 3 7 12 15 8 3 2

wht is the meaning of deviation in mean and median xplain with example

how can we choose assumed mean?

How do we know which value to take as assumed mean ?

The mean and standard deviation of a group of 100 observations were found to be 20 and 3 respectively.Later on it was found that 3 observations were incorrect which were recorded as 21,21 and 18.Find the mean and Standard deviaton if the incorrect observations were omitted.

Find the mean and standard deviation using short-cut method.

x_{i}60

61

62

63

64

65

66

67

68

f_{i}2

1

12

29

25

12

10

4

5

Can anyone explain to me how to do the7thquestion on ex 15.1 class 11cbse. Idontunderstand the solution given on thencertsolutions.

Q. Find the mean deviation about the median for the data given below:

Xi 5 7 9 10 12 15

Fi 8 6 2 2 2 6

Please answer fast

An original frequency table with mean 11 and variance 9.9 was lost but the following table derived from it was found. Contruct the original table.

Value of 'd':- -2,-1,0,1,2

Frequency(f):- 1,6,7,4,24

An analysis of monthly wages paid to workers in two firms A and B, belonging to the same industry, gives the following results:

Firm A

Firm B

No. of wage earners

586

648

Mean of monthly wages

Rs 5253

Rs 5253

Variance of the distribution of wages

100

121

(i) Which firm A or B pays larger amount as monthly wages?

(ii) Which firm, A or B, shows greater variability in individual wages?

The variance of 15 observation is 4. If each observation is increased by 9, find the variance of resulting observation.

19.Find the variance for the following data :If the mean deviation about the median of the numbers a,2a,3a........,50a is 50. Then "modulus of a" equals ?? plz answer fast..

if each of the observations x1,x2,x3,.....,xn is increased by a, where a is a negative or positive number show that the variance remains unchanged.

how to take out the square root by completing the squares method

Find the mean deviation from the mean and standard deviation of the series:

a, a+d, a+2d, ....., (a+nd), .... a+(2n-1)d, a+2nd

In the above video on what basis we had taken " A " = 10

yes... how do you calculate assumed mean?

Find the mean and variance for the following frequency distribution.

if we find it by long method and the short cute method , the answer is not matching. please experts answer this in boh the ways

Classes

0-30

30-60

60-90

90-120

120-150

150-180

180-210

Frequencies

2

3

5

10

3

5

2

The mean and variance of eight observations are 9 and 9.25, respectively. If six of the observations are 6, 7, 10, 12, 12 and 13, find the remaining two observations.

solution of chapter average due date of maths isc 11

sum 10the median is 9 and the only mode is 7, what is the

least possible range for the 7 numbers?

The age distribution of 100 life-insurance policy holders is as follows

Age (on nearest 17-19.5 20-25.5 26-35.5 36-40.5 41-50.5 51-55.5 56-60.5 61 - 70.5

birth day)

No of persons 5 16 12 26 14 12 6 5

Calcualte the mean deviation from the median age.

how to solve median using cumilative frequency?what do you mean by statistics?

Jack recorded the amount of time he studied the night before each of 4 history quizzes and the score he got on each quiz. The data are in the table below.

Use linear regression to estimate the score Jack would get if he studied for 20 minutes.

A. 71

B. 72

C. 73

D. 74

E. 75

how to solve question no 5 of page 376 stat of class 11 explain in a easy way

find the ratio in which the line joining the line joining the points 1,2,3,and -3,4,-5 by xy plane

Find the mean and variance for the first

nnatural numbers