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Syllabus

What is assumed mean &how can we find it

how to use log & antilogtable to find square roots

calculate mean and standard deviation from the following data using direct method

size 10-20 20-30 30-40 40-50 50-60 60-70 70-80

frequency 5 10 15 20 25 18 78

What is the difference between mean deviation and standard deviation?

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

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

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

more than 50 100

more than 55 98

more than 60 90

more than 65 78

more than 70 54

more than 75 16

find median

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?

Wages (up to ) 10 20 30 40 50 60 70 80

no. of workers 12 30 65 107 157 202 222 230

find the coefficient of variation ?

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 ?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

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..

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.Define Mean and Median,and also the Difference..

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.

Statement I: The mean salary would remain the same.

Statement II: The median salary would remain the same.

how to find assumed mean in statistics

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

how to calculate assumed mean ?

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

x– 2xx^{2}x+ 1)^{2}xx+ 1where,

xis a positive integer. Determine the mean and standard deviation of the marks.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

find the variance for the first 25 natural numbers

Q15. If the median of 5, 9, 11, 3, 4, x, 8 is 6, find the value of x.

Sol. Arranging in ascending order, 3, 4, 5, x, 8, 9, 11,

Here n = 7 which is odd.

$\therefore \mathrm{Median}={\frac{n+1}{2}}^{\mathrm{th}}\mathrm{term}=\frac{7+1}{2}={4}^{\mathrm{th}}\mathrm{term}=x\phantom{\rule{0ex}{0ex}}\therefore \mathrm{But}\mathrm{median}=6\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\therefore x=6$

what is

method ?assume meanClasses- 30-40 40-50 50-60 60-70 70-80 80-90 90-100

frequency 3 7 12 15 8 3 2

how to make a discrete class to a continuous class for e.g.--- 0-17 67-85

how can we choose 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.

Q.4. Find the mean deviation from the mean 6, 7, 10, 12, 13, 4, 8, 20

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

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?

## Consider the following statements

(1) Mode can be computed from histogram

(2) Median is not independent of change of scale

(3) Variance is independent of change of origin and scale .which of the above is/are correct

but why is 2 correct and 3 not correct, please explain with reason please

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

how to findC.F..??? plzz helpIf 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

Hint.Construct the following table :yes... how do you calculate assumed mean?

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.

i did'nt get mean deviation of median.......Plz explain

solution of chapter average due date of maths isc 11

sum 10The 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.

what do you mean by statistics?

correct option is A

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

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

least possible range for the 7 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.

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

what is mean deviation ?

Find the mean and variance for the first

nnatural numbers