سؤآل في الاحصاء ( لو سمحتوا اللي يعرف يدخل )

[Rafo0ofh]

السلام عليكم
لو سمحت ممكن احد يقولي كيف طريقة حل هادا السؤال

16.

If 4 different-sized washers ( غسالات ) are arranged in a row, then the probability that they
will be arranged in order of size is

A)

4!

B)

1
24

C)

1
12

D)

1

هوا يطلع الناتج 1\12
طبعا السؤال 16 في الاختبار التاني


وهادا كمان

28.

In a certain company, it is known that 20% of the staff members are smokers. A random
sample of 5 staff members is selected at random, let X represents the number of smokers
in the sample.
Find the probability that at most 4 staff members are smokers.

A)

0.00032

B)

0.0016

C) 0.8

D) 0.99968

وهادا السؤال من اختبار النهائي حق الترم اللي فات اول السنه للي فاتت مدري

30.

Find two z values so that 41.08% of the middle area is bounded by them

A)

± 1.35

B)

± 0.4108

C)

± 0.54

D) ± 0.2054