بليييييييييز ساعدوني عندي أسئله في الإحصاء أبغى تجاوبوا عليها ضروري

[*بسمة أمل*]

ياجماعة هادي الاسئلة من الاختبارات بس ماعرفت احلها ياليت لو احد يعرف طريقة حلها يقلي الله يسعدكم

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

34. If 3% of calculators are defective, find the standard deviation of the defectives in
300 calculators?
A) 2.95
B) 0.79
C) 8.73
D) 9


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


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