EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 11 students in a test are given below. Find the mean score.
19
4
12
6
19
9
12
19
4
4
14
(i)
11
1
11
(ii)
15
(iii)
4
(iv)
12
(v)
19
Question
2
2.
The marks obtained by 15 students in a test are given below. Find their mean marks.
15
19
49
12
48
11
3
41
36
11
16
14
23
22
36
(i)
356
15
(ii)
310
13
(iii)
118
5
(iv)
402
17
(v)
358
15
Question
3
3.
Heights of 14 students (in cm) are given below. Find the mean height.
129
170
142
135
156
148
130
126
144
169
143
174
148
151
(i)
299
2
cm
(ii)
295
2
cm
(iii)
148
cm
(iv)
297
2
cm
Question
4
4.
Heights of 15 plants (in cm) are given below. Find the mean height.
59
89
78
96
87
97
85
66
72
72
53
97
99
91
80
(i)
417
5
cm
(ii)
412
5
cm
(iii)
407
5
cm
(iv)
409
5
cm
(v)
408
5
cm
Question
5
5.
Ages of 11 students (in years) are given below. Find the mean age.
10
15
14
10
15
15
10
12
13
12
11
(i)
148
11
years
(ii)
138
11
years
(iii)
139
11
years
(iv)
137
11
years
(v)
159
11
years
Question
6
6.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
11
15
9
7
15
6
13
12
5
9
5
7
6
(i)
133
13
mm
(ii)
120
13
mm
(iii)
146
13
mm
(iv)
122
13
mm
(v)
121
13
mm
Question
7
7.
Scores of 12 students are given below. Find the mean score.
90
86
72
81
87
73
78
82
73
72
81
84
(i)
983
12
(ii)
959
12
(iii)
971
12
(iv)
80
(v)
961
12
Question
8
8.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
31
35
32
35
26
28
35
27
34
31
34
33
31
25
(i)
437
14
°C
(ii)
451
14
°C
(iii)
465
14
°C
(iv)
439
14
°C
(v)
219
7
°C
Question
9
9.
Weights of 14 students (in kg) are given below. Find the mean weight.
44
50
41
54
56
49
45
57
51
43
54
54
55
41
(i)
347
7
kg
(ii)
354
7
kg
(iii)
361
7
kg
(iv)
349
7
kg
(v)
348
7
kg
Question
10
10.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
466
409
420
415
440
357
443
466
487
450
(i)
₹
435.30
(ii)
₹
435.50
(iii)
₹
437.30
(iv)
₹
435.40
(v)
₹
436.30
Question
11
11.
The arithmetic mean of
37
6
28
16
49
is
(i)
25.2
(ii)
29.2
(iii)
27.2
(iv)
26.2
(v)
28.2
Question
12
12.
If the mean of
8
6
1
x
5
7
is
5
,
find the value of x.
(i)
6
(ii)
3
(iii)
4
(iv)
2
(v)
1
Question
13
13.
The mean of the below random sample is
31
7
10
.
Find the missing quantity.
48
42
39
20
31
36
45
x
12
22
(i)
20
(ii)
23
(iii)
22
(iv)
25
(v)
21
Question
14
14.
Given the mean of
8
samples as
11
,
what is the mean if a sample value is
increased
by
12
?
(i)
25
2
(ii)
13
(iii)
27
2
(iv)
49
4
(v)
23
2
Question
15
15.
Given the mean of
6
samples as
6
1
2
,
what is the mean if a sample value is
decreased
by
18
?
(i)
5
2
(ii)
13
4
(iii)
4
(iv)
7
2
(v)
9
2
Question
16
16.
Given the mean of
10
samples as
3
9
10
,
what is the new mean if two samples
9
and
10
are added ?
(i)
31
6
(ii)
9
2
(iii)
37
8
(iv)
21
4
(v)
29
6
Question
17
17.
Given the mean of
12
samples as
5
5
12
,
what is the new mean if two samples
4
and
9
are removed ?
(i)
24
5
(ii)
16
3
(iii)
36
7
(iv)
26
5
(v)
28
5
Question
18
18.
Find the mean of all prime numbers between 50 and 80.
(i)
331
5
(ii)
465
7
(iii)
595
9
(iv)
463
7
(v)
461
7
Question
19
19.
Find the mean of all prime numbers between 50 and 60.
(i)
57
(ii)
58
(iii)
54
(iv)
55
(v)
56
Question
20
20.
Find the mean of first 8 multiples of 6.
(i)
24
(ii)
30
(iii)
28
(iv)
27
(v)
26
Question
21
21.
Find the mean of first 7 whole numbers.
(i)
4
(ii)
3
(iii)
0
(iv)
5
(v)
2
Question
22
22.
Find the mean of first 8 multiples of 18.
(i)
84
(ii)
80
(iii)
79
(iv)
81
(v)
82
Question
23
23.
Find the mean of the first 20 odd numbers.
(i)
21
(ii)
23
(iii)
17
(iv)
19
(v)
20
Question
24
24.
Find the mean of the first 10 even numbers.
(i)
13
(ii)
9
(iii)
10
(iv)
11
(v)
12
Question
25
25.
The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 8.
41
21
12
44
17
28
38
20
6
9
8
40
27
40
16
(i)
487
15
(ii)
97
3
(iii)
423
13
(iv)
551
17
(v)
163
5
Question
26
26.
The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 7.
37
21
19
22
37
33
27
15
7
10
7
(i)
156
11
(ii)
186
13
(iii)
160
11
(iv)
158
11
(v)
130
9
Question
27
27.
The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
37
15
30
5
23
7
47
4
47
38
40
20
24
39
(i)
376
7
(ii)
374
7
(iii)
482
9
(iv)
54
Question
28
28.
If the mean of
4
samples is
31
,
what is the new mean if each number is multiplied by
9
.
(i)
278
(ii)
280
(iii)
279
(iv)
282
(v)
277
Question
29
29.
The mean of
8
numbers is
10
7
8
.
Upon
excluding
one number,
the mean becomes
10
4
7
.
Find the
excluded
number.
(i)
15
(ii)
11
(iii)
14
(iv)
12
(v)
13
Question
30
30.
The mean of
6
numbers is
14
.
Upon
adding
one number,
the mean becomes
14
1
7
.
Find the
included
number.
(i)
16
(ii)
13
(iii)
17
(iv)
15
(v)
14
Assignment Key
1) (i)
2) (i)
3) (ii)
4) (iii)
5) (iv)
6) (ii)
7) (ii)
8) (i)
9) (i)
10) (i)
11) (iii)
12) (ii)
13) (iii)
14) (i)
15) (iv)
16) (v)
17) (iv)
18) (iv)
19) (v)
20) (iv)
21) (ii)
22) (iv)
23) (v)
24) (iv)
25) (i)
26) (iv)
27) (i)
28) (iii)
29) (v)
30) (iv)
