سؤال في الاحصاء الدوري الثاني

[ohoud M]

السلام عليكم
ممكن احد يشرحلي كيف طلع الحل في الكم سؤال هذي في جزئيه الاحصاء الدوري الثاني

One company's ID cards consist of 2 letters followed by 2 digits. How many cards be made if repetition are not allowed?

A. 4
*B. 58500
C. 60
D. 67600

A student takes a 4 questions multiple choices quiz with 3 choices for each question. If the student guesses (

تخمين ) at random on each question, What is probability that student gets exactly 1 question is wrong?

A) 0.395
B) 0.141
*C) 0.099
D) 0.25

At Jarir store ,If we found 4% of HP printers are defective, find the mean for the defective of 200 printers.
*

A) 8
B) 192
C) 7.68
D) 10

At University of Akron

54.3 % of incoming first-year students have computers .If 3 students are selected at random ,find the probability at least one has a computer.

A) 0.265
B) 0.506
C) 0.977
*D) 0.904

وشكراً