‫االختبار األول‬
‫الفصل الثاني‪1430 / 1429‬‬
‫مقرر ‪ 145‬احص‬
‫جامعة الملك سعود‬
‫كلية العلوم‬
‫قسم اإلحصاء وبحوث العمليات‬
‫الساعة ‪1 – 12‬‬
‫السبت ‪ 1430 / 5 /21‬هـ‬
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‫أستاذة المقرر ‪----------------------------------------------------------------------------------- :‬‬
‫‪For each question, write the letter in the space given in the following‬‬
‫‪table‬‬
‫‪10‬‬
‫‪9‬‬
‫‪8‬‬
‫‪7‬‬
‫‪6‬‬
‫‪5‬‬
‫‪4‬‬
‫‪3‬‬
‫‪2‬‬
‫‪1‬‬
‫‪Question‬‬
‫‪Answer‬‬
‫‪20‬‬
‫‪19‬‬
‫‪18‬‬
‫‪17‬‬
‫‪16‬‬
‫‪15‬‬
‫‪14‬‬
‫‪13‬‬
‫‪12‬‬
‫‪11‬‬
‫‪Question‬‬
‫‪Answer‬‬
‫‪25‬‬
‫‪24‬‬
‫‪23‬‬
‫‪22‬‬
‫‪21‬‬
‫‪Question‬‬
‫‪Answer‬‬
‫‪Good Luck‬‬
‫‪1‬‬
Question(1):
In a study of the daily fat intake (in grams) for a sample of adults in Saudi
Arabia females .For the study , Answer the following questions:
1-The variable is
(a) Quantitative
row
Daily fat
frequency
(b) Adults female in Saudi Arabia
intakes
(c) Daily fat intake (d)continuous
1
25-44
4
(d) none of these
2
45-64
9
2-The class width is
(a) 20 (b)10
(c) 150
3
65-84
30
(d) 19 (e) none of these
4
85-104
3-Number of adults female in
5
105-124
36
Saudi Arabia with daily fat intake
between 85 and 104 gram is
6
125-144
24
(a) 30 (b)27
(c) 33
7
145-164
16
(d) 28 (e) none of these
8
165-185
4
4-Relative frequency of adults
Total
150
female in Saudi Arabia with daily
fat intake greater than 144 gram is
(a) 24
(b)20
(c) 0.20
(d) 0.133
(e) none of these
5-Percent of adults female in Saudi Arabia with daily fat intake between
105 and 164 gram is
(a)24%
(b)10.67%
(c) 76%
(d)50.67%
(e) none of these
6-The 6th midpoint is
(a)143.5 (b)114.5
(c) 134.5
(d) 269
(e) none of these
7-The range is
(a)19
(b) 160
(c) 20
(d) 140
(e) none of these
8-The third true class is
(a)64.5-84.5 (b)74.5
(c)70.5
(d)65.5-84.5 (e) none of these
9-The appropriate diagram for this table is
(a) Pie chart
(b) Histogram
(c) Bar chart
(d) none of these
10-The third cumulative frequency is
(a)30
(b) 13
(c) 43
(d) 10
(e) none of these
___________________________________________________________
2
Question(2):
We measure the number of visits to certain club made by a random
sample of 10 person during a year as follow 10, 11, 4, 14, 4, 12, 5, 13, 12,
and 3. Then
11- The type of variable is
(a) Number of visits
(b) qualitative
(c) discrete
(d) Continuous
(e) none of these
12- The sample mean is
(a) 18.4
(b) 8.8
(c) 10.5
(d) 4.29
(e) none of these
(c) 10.5
(d) 4.29
(e) none of these
(c) 10.5
(d) 5, 6
(e) none of these
(c) 12
(d) 10
(e) none of these
13- The sample standard deviation is
(a) 18.4
(b) 8.8
14- The sample median is
(a) 4.29
(b) 10
15- The sample mode is
(a) 4
(b) 4, 12
_________________________________________________________
* If we measure the age of students for samples from faculties of art and
science
16-Which group of students has less
variation
X
S
21
5
Faculty of science 19
3
Faculty of art
(a) Same variation
(c) students of Science
(b) Students of Art
(d) can't decide
___________________________________________________________
17- Effected by extreme values
(a) Mean
(b) median
(c) mode
(d) none of these
18 - For any given data, we can have no
(a) Mean
(b) variance
(c) mode
(d) median
3
(e) none of these
Question(3)
In a study on the prevalence )‫ (انتشار‬of the disease brucellosis ‫(مرض يصيب‬
)‫ الحيوانات‬among animals, samples were taken from four types of animals
and each animal was tested and classified by the presence or absence of
brucellosis.
Brucellosis present
Type of animal
Yes
No
Camels
12
41
Goats
14
63
Cows
9
49
Sheep
7
50
Total
42
203
Suppose we select an animal at random
19- The probability that the animal has brucellosis is
(a) 0.8286 (b) 0.1714 (c)0.0490
(d) 0.2857
Total
53
77
58
57
245
(e) none of these
20 -The probability that the animal is a camel and does not have
brucellosis is
(a) 41
(b) 0.0490
(c) 0.1673 (d) 0.2163
(e) none of these
21-The probability that the animal is a cow or a goat is
(a) 0.551 (b) 0.0939
(c) 0.4571
(d) 0
(e) none of these
22-If we pick an animal at random and find that it is a cow, what is the
probability that the animal has brucellosis?
(a) 0.0367 (b) 0.2143 (c) 0.1552 (d) 0.1714
(e) none of these
23-What is the probability that the animal is not a sheep?
(a) 0.7673 (b) 0.2327 (c) 0.0286 (d) 0.1429
(e) none of these
24-What is the probability that the animal is a goat or has brucellosis?
(a) 0.0571 (b) 0.8858 (c) 0.2571 (d) 0.4286
(e) none of these
25-Are the events: the animal is a sheep and having the disease mutually
exclusive?
(a) Yes
(b) No
(c) Can't decide
End of the questions
4