أي أحد عندوو سؤال في الاحصاء يتفضل ..

[فيصل الفريد]

عندي هل الأســـــــــــــئلة أبي طريقة حلها بالتفصيل عشان أفهمها تكفون ....................
1. How many different ways can four people: Andy, Betty, Cindy, and Doug, sit in a
row at the cinema if Andy and Betty must sit together?
A) 18
B) 6
C) 12
D) 24
الجواب 12 بس كيف جابه وهو مو معطيني أرقام في السوال ........


7. 3 statistics professors and 7 chemistry professors are available to be advisors to a
student organization. The student organization needs two of the professors to be
advisors, what is the probability that both professors are chemistry professors?
A) 0.111
B) 0.233
C) 0.100
D) 0.467

الجـــــــــــواب : 0.467

12. The number of beds in 8 hospitals in Jeddah is 230, 410, 540, X, 620, 1200, 1250
and 1300, where X is unknown value. If the median is 600, then the value of X is
A) 580
B) 420
C) 850
D) 620

الجــــــــــــواب 580

22. The average repair cost of a microwave oven is 55$, with a standard deviation of 8$.
the costs are normally distributed. If 12 ovens are repaired, find the probability that
the mean of the repair bills will be greater than 60$.
A) 0.0707
B) 0.015
C) 0.1236
D) 0.3707
الجــــــــــواب : b

23. The average height of a certain age group of people is 53 inches and the standard
deviation is 4 inches. If the variable is normally distributed, find the probability that
a selected individual's will be less than 57 inches.
A) 1
B) 0.3413
C) 0.8413
D) 0.1587
الجواب : c


24. What z value corresponds to 17% of the data between the mean and the z value?
A) 2.1
B) 0.52
C) 0.125
D) 0.44
ا
لجواب d
37. An instructor gives a 100 point examination in which the grades are normally
distributed. The mean is 60 and the standard deviation is 10. If there are 5% A+ . find
the lowest possible score to get A+?
A) 96
B) 76.5
C) 43.5
D) 61.3

33. A student takes a 7 question multiple choice quiz with 4 choices for each question. If
the student guesses at random on each question, what is the probability that the
student gets exactly 3 questions correct?
A) 0.346
B) 0.043
C) 0.173
D) 0.130