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Syllabus

What is assumed mean &how can we find it

how to use log & antilogtable to find square roots

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

frequency 3 7 12 15 8 3 2

What is the difference between mean deviation and standard deviation?

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

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

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?

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

what is central tendency ????

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

From the data given below state which group is more variable, A or B?

Marks

10-20

20-30

30-40

40-50

50-60

60-70

70-80

Group A

9

17

32

33

40

10

9

Group B

10

20

30

25

43

15

7

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 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.

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.....

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.If the mean deviation about the median of the numbers a,2a,3a........,50a is 50. Then "modulus of a" equals ?? plz answer fast..

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

calculate 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

how to calculate assumed mean ?

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

Q18. The mean and variance of a set of 10 values are known to be 17 and 33 respectively. Of the ten values one value 26 was subsequently found inaccurate and was weeded out. What is the resulting mean and the resulting standard deviation ?

Define Mean and Median,and also the Difference..

find the variance for the first 25 natural numbers

Find the mean and variance for the first

nnatural numberswhat is

method ?assume meanhow can we choose assumed mean?

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

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.

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

least possible range for the 7 numbers?

From the prices of shares X and Y below, find out which is more stable in value:

X

35

54

52

53

56

58

52

50

51

49

Y

108

107

105

105

106

107

104

103

104

101

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

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

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?

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?

Find the mean deviation about the median for the data.

13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17

solution of chapter average due date of maths isc 11

sum 10The following is the record of goals scored by team A in a football session:

No. of goals scored

0

1

2

3

4

No. of matches

1

9

7

5

3

For the team B, mean number of goals scored per match was 2 with a standard

deviation 1.25 goals. Find which team may be considered more consistent?

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.

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.

The weighted mean is:

(a) 58.46

(b) 58.43

(c) 58.49

(d) 58.45

what do you mean by statistics?

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

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

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

structures used to model pairwise relations between objects from a certain collection. A

graph in this context is a collection of vertices or nodes and a collection of edges that

connect pairs of vertices. An edge may be undirected, meaning that there is no distinction

between the two vertices associated with it, or directed, in which it is directed from one

vertex to another. The graph, in addition to vertices, may contain only undirected edges

or only directed edges or a combination of both. The graphs studied in graph theory

should not be confused with the graphs of functions or other kinds of graphs.

Graphs can be used in modelling and treatment of many problems of practical inter-

est in physical, biological and social systems. In computer science, graphs are used to

represent networks of communication, data organization, computational devices, flow of

computation, etc. In chemistry a graph makes a natural model for a molecule, where

vertices represent atoms and edges represent bonds. This approach is especially used in

computer processing of molecular structures. Likewise, graph theory is useful in conser-

vation biology where a vertex can represent regions where certain species exist and the

edges represent migration paths, or movement between the regions. This information is

important when looking at breeding patterns or tracking the spread of diseases or how

changes in the movement of one species can affect the other species.Among the following statements, the false statement is

(A) In a study of interacting particles, mutual forces can be taken as edges.

(B) In a study of a bus network, zonal boundaries can be taken as edges.

(C) In the nervous system, sensory receptors can be taken as vertices.

(D) In a study of government aid programme, aid recipients can be taken as ver-

tices.

Find the mean and variance for the first 10 multiples of 3

Find the mean and variance for the following frequency distribution.

Classes

0-10

10-20

20-30

30-40

40-50

Frequencies

5

8

15

16

6