أسئلــــة جديده في الأحصاء بالله أشرحولي أيها ضرورررررري

[فيصل الفريد]

صراحه شفت مواضيع الأحياء ملايانه قلت أكتب في موضوع ثاني أحسن
بالله جابولي على هذه الأسئلة بالتفصيل ... معليش راح اتعبكم ....

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
هذا السوال محد قد شرحه كيف بالله جاب الأرقام مو معطيني في السؤال ..وطريقة الحل

3statistics 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

18. Urn 1 contains 5 red balls and 3 black balls. Urn 2 contains 3 red balls and 1 black
ball. Urn 3 contains 4 red balls and 2 black balls. If an urn is selected at random and
a ball is drawn. Find the probability it will be red?
A)
2
3
B)
49
72
C)
23
72
D)
49

24

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) 0.158

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

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