statistics class 11 ncert solutions, business statistics, basic statistics, statistics basics, statistics tutorials, introduction to statistics, statistics formulas, msc statistics, statistical, application of statistics, statistic, cricket statistics, statistical methods, indian statistical institute, statistical tools, statistics notes, what is statistics, agriculture statistics, statistics for management, statistics books, project on statistics… , ncert solutions, chapter 15,chapter 15ncert solutions, statistics ncert solutions, ncert solutions for class 11 maths, class 11 maths ncert solutions, ncert solutions for class 11, ncert class 11 maths, class 11 maths, class 11 maths solution, ncert solutions class 11, class 11 maths , ncert class 11, class 11 maths chapter 15,chapter 15
Find the mean deviation about the mean for the data in Exercises 1 and 2.
Question 1. 4, 7, 8, 9, 10, 12, 13, 17
Question 2. 38, 70, 48, 40, 42, 55, 63, 46, 54, 44
Find the mean deviation about the median for the data in Exercises 3 and 4.
Question 3. 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17
Question 4. 36, 72, 46, 42, 60, 45, 53, 46, 51, 49
Find the mean deviation about the mean for the data in Exercises 5 and 6.
Question 5. xi 5 10 15 20 25 f i 7 4 6 3 5
Question 6. xi 10 30 50 70 90 f i 4 24 28 16 8
Find the mean deviation about the median for the data in Exercises 7 and 8.
Question 7. xi 5 7 9 10 12 15 f i 8 6 2 2 2 6
Question 8. xi 15 21 27 30 35
f i 3 5 6 7 8
Find the mean deviation about the mean for the data in Exercises 9 and 10.
Question 9. Income 0-100 100-200 200-300 300-400 400-500 500-600 600-700 700-800
per day
Number 4 8 9 10 7 5 4 3
of persons
Question 10. Height 95-105 105-115 115-125 125-135 135-145 145-155
in cms
Number of 9 13 26 30 12 10
boys
Question 11. Find the mean deviation about median for the following data :
Marks 0-10 10-20 20-30 30-40 40-50 50-60
Number of 6 8 14 16 4 2
Girls
Question 12. Calculate the mean deviation about median age for the age distribution of 100
persons given below:
Age 16-20 21-25 26-30 31-35 36-40 41-45 46-50 51-55
Number 5 6 12 14 26 12 16 9
Find the mean and variance for each of the data in Exercies 1 to 5.
Question 1. 6, 7, 10, 12, 13, 4, 8, 12
Question 2. First n natural numbers
Question 3. First 10 multiples of 3
Question 4. xi 6 10 14 18 24 28 30
fi 2 4 7 12 8 4 3
Question 5. xi 92 93 97 98 102 104 109 f i 3 2 3 2 6 3 3
Question 6. Find the mean and standard deviation using short-cut method.
xi 60 61 62 63 64 65 66 67 68
f i 2 1 12 29 25 12 10 4 5
Find the mean and variance for the following frequency distributions in Exercises
7 and 8.
Question 7. Classes 0-30 30-60 60-90 90-120 120-150 150-180 180-210
Frequencies 2 3 5 10 3 5 2
Question 8. Classes 0-10 10-20 20-30 30-40 40-50
Frequencies 5 8 15 16 6
Question 9. Find the mean, variance and standard deviation using short-cut method
Height 70-75 75-80 80-85 85-90 90-95 95-100 100-105105-110 110-115
in cms
No. of 3 4 7 7 15 9 6 6 3
children
Question 10. The diameters of circles (in mm) drawn in a design are given below:
Diameters 33-36 37-40 41-44 45-48 49-52
No. of circles 15 17 21 22 25
Calculate the standard deviation and mean diameter of the circles.[ Hint First make the data continuous by making the classes as 32.5-36.5, 36.5-40.5,
40.5-44.5, 44.5 - 48.5, 48.5 - 52.5 and then proceed.]
Question 1. 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
Question 2. 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
Question 3. 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 100 121
of wages
(i) Which firm A or B pays larger amount as monthly wages?
(ii) Which firm, A or B, shows greater variability in individual wages?
Question 4. The 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?
Question 5. The sum and sum of squares corresponding to length x (in cm) and weight y
(in gm) of 50 plant products are given below:
50
1
i 212
i
x
=
Σ = ,
50
2
1
i 902 8
i
x .
=
Σ = ,
50
1
i 261
i
y
=
Σ = ,
50
2
1
i 1457 6
i
y .
=
Σ =
Which is more varying, the length or weight?
Please Wait pdf file is loading (कृपया इंतजार करें pdf file लोड हो रही है)...
Loading speed will depend up on your download speed. Pdf file के लोड होने में लगा समय आपकी डाउनलोड स्पीड पर निर्भर करेगा
Copyright @ ncerthelp.com A free educational website for CBSE, ICSE and UP board.