اسئلة من نموذج فاينال الاحصاء ساعدووني >.< !

[julia.jay]

احم احم زي ما هوا واضح من العنوان
عندي كم سؤال في نموذج فاينال الاحصاء مني عارفة احلهاا !!

لو احد عرف يجاوبها بلللز لا يطنش

بسم الله
نبدأ :

1- how many 3-digit passwords are possible if digits can be repeated ?

the answer is : 1000

2- the average weight of books on a library f is 8.3 grams.
the standard deviation is 0.6 grams.
if 20% of the books are oversized ،
find the minimum weight of the large books on the library f
. assume the variable is normally distributed.
(ذات حجم كبير)

the answer is : 8.804 grams

3-if a normal distribution has a mean 22 and a standard deviation 4, then

the answer is : the median is 22 and the mode is 22

هو عشانو سيميترك ؟ طيب مو هوا الستاندرد ديفيجن المفروض يكون 1 ؟

4- find two z values so that 41.08% of the middle area is bounded by them

the answer is : +,- 0.54

5- the average repair coast of a microwave oven is 55$
, with a standard deviation of 8$. the costs are normally distributed.
if 12 ovens are repaired ,
find the probability that the mean of the oven repair will be greater than 60$.
(تكلفة التصليح)

the answer is : 0.015

6- how many times a die is rolled when the mean for the number of 3's that will be rolled=60.

the answer is : 360


هيا دي الاسئلة بللزز اليي يعرف كييف انحللت او القوانين الي حنستخدمها يساعدنيي حتى لو بعضها

الله يوفق و يحقق كل امنيات الشخص الي حيساعدني يا رب !