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Syllabus

What is assumed mean &how can we find it

how to use log & antilogtable to find square roots

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 ?

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

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

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

frequency 3 7 12 15 8 3 2

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 ????

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

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.

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..

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.

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.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.

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

how to calculate assumed mean ?

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

Define Mean and Median,and also the Difference..

find the variance for the first 25 natural numbers

what is

method ?assume meanif 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.

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

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.

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

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

Find the mean deviation about the median for the data.

x_{i}5

7

9

10

12

15

f_{i}8

6

2

2

2

6

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

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?

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?

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

9. The variance of 20 observations is 5. If each observation is multiplied by 2, then find the variance of the resulting observations.

solution of chapter average due date of maths isc 11

sum 10The 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.

what do you mean by statistics?

Find the mean deviation about the median for the following data:

xi : 15 21 27 30 35

fi : 3 5 6 7 8

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

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

the following are the run score by two batsmen A and B in 10 innings. find who is more consistence?

A: 101. 20. 0. 36. 82. 45. 7. 13. 65. 14

B: 97. 12. 40. 96. 13. 8. 85. 8. 56. 15

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

least possible range for the 7 numbers?

Find the mean deviation about median for the following data:

Marks

Number of girls

0-10

6

10-20

8

20-30

14

30-40

16

40-50

4

50-60

2

Find the mean deviation about the median for the data.

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