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Syllabus

What is assumed mean &how can we find it

how to use log & antilogtable to find square roots

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

What is the difference between mean deviation and standard deviation?

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

Find out coefficient of variation in the marks awarded by two judges and interpret the result.

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

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 central tendency ????

Th scores of 10 students in a test,out of maximum marks 50 are as follows :28 , 36 , 34 , 28 , 48 , 22 , 35 , 27 , 19 , 41.

Find the variance.

x– 2xx^{2}x+ 1)^{2}xx+ 1where,

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

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.....

Given thatisthe mean and σ

^{2}is the variance ofnobservationsx_{1},x_{2}…x_{n}. Prove that the mean andvariance of the observationsax_{1},ax_{2},ax_{3}…ax_{n }are anda^{2}σ^{2},respectively (a≠ 0).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..

Diameter (mm) : 43-45 46-48 49-51 52-54 55-57

Number of nuts : 175 236 200 196 193

Determine the mean inner diameter per nut.

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.

F=20,12,2,4,5,3,4

how to find assumed mean in statistics

No. of heads Frequency

0-4 10

5-9 45

10-14 40

15-19 5

Find the median number of heads obtained

Find the median number of Tails obtained

how to calculate assumed mean ?

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

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

frequency 3 7 12 15 8 3 2

Define Mean and Median,and also the Difference..

find the variance for the first 25 natural numbers

For a truck that can carry 2000 cubic feet, hiring cost per day is Rs 1000. Storing cost per cubic feet is Rs 5 per day. If the storage cost is reduced to Rs 0.8 per cubic feet per day, then on which day/days, the truck should be hired?

(A) 4

^{th}^{ }(B) 7^{th}(C) 4^{th}^{ }and 7^{th}(D) None thesewhat is

method ?assume meancalculate the mean and standard deviation for the following:

size of item: 6 , 7 ,8 , 9, 10 , 11 , 12

frequency : 3 , 6, 9 , 13 , 8 , 5 ,4

what is cumilative frequency?

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.

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

If 55% of the workers fulfil their requirements , find the minimum daily earnings to met the requirements of a worker.

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

Q2. Mean of n items is $\overline{)x}$. If these x items are successively increased by 2, 2

^{2}, 2^{3},..... 2^{n}then the new mean is(A) $\overline{)x}$ + $\frac{{2}^{\mathrm{n}+1}}{\mathrm{n}}$ (B) $\overline{)x}$ + $\frac{{2}^{\mathrm{n}+1}}{\mathrm{n}}-\frac{2}{\mathrm{n}}$ (C) $\overline{)x}$ + $\frac{{2}^{\mathrm{n}}}{\mathrm{n}}$ (D) None of these

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.

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

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.

sir,

i could not understand the finding of median in example 1

how is m=14????????? pls ans soon

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?

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

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

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

least possible range for the 7 numbers?

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