Question is Stat

[a7la shog]

ممكن احد يشرح لي قاعدة At least اللي في تشابتر 4

معليش نسيتها :(

ومشكورين مقدما

[حياتي بقربك]

ياحلوين انا لمن حضرت سكشن الاحصاء قالتلنا الدكتوره انه فيه 4 او 5 حالات
بس ورقتي ضاعت
ياليت اللي فاهمه الباب تلخصلنا الحالات
ومتى اللي نطرح او نجمع من 1 او 5.
بانتظاااركم

[حياتي بقربك]

المشاركة الأصلية كتبت بواسطة a7la shog ممكن احد يشرح لي قاعدة At least اللي في تشابتر 4 معليش نسيتها :( ومشكورين مقدما

coin في حالة

Find the probability of getting at least one …..

•

(1) A coin is tossed 3 times
N (s) = 23 = 8
... P (at least one tail) = N(s )/N( s–) 1 = 8/8-1 = 7/8

•

(2) A coin is tossed 5 times :
N (s) = 25 = 32
... P (at least one head) = N N(s )( s–) 1 =32-1 / 32= 31/32
في حالة النسبه المئويه

Example:

It has been found that 6% of all automobiles on the road have
defective brakes. If 5 automobiles are stopped and checked by
the state police, find the probability that at least one will have
defective brakes.

A = at least one have defective brakes
A′ = no have defective brakes
P(defective) = 0.06 P(undefective) = 1 – 0.06 = 0.94

P(A′ ) = (0.94) (0.94) (0.94) (0.94) (0.94) = 0.7339

P(A) = 1 – P(A′ ) = 1 – 0.7339 = 0.266
أتمنى وضحت

[shox2]

سؤال لطيف ظريف




A die is rolled 5 times ,, the probabilityof getting a number 5 one time only is ......
A- 0.402
B- 0.278
C- 0.386
D- 0.347

الجواب A

[ζ ـــږۉف الـتـ’ـمـيـــزْ]

المشاركة الأصلية كتبت بواسطة shox2 سؤال لطيف ظريف A die is rolled 5 times ,, the probabilityof getting a number 5 one time only is ...... A- 0.402 B- 0.278 C- 0.386 D- 0.347 الجواب A

n=5
x=1
p=1/6 احتمال ظهور العدد 5
q=5/6

5C1×(1/6)×(5/6)*4
=0.401
بالتقريب =0.402

[حياتي بقربك]

ممكن احد يفهمني ؟

Use the following to answer questions 29-31:
A multiple choice quiz consists of 6 questions, each with 5 possible answers. If a student guesses the answer
of each question, then
29. the probability of at least one correct answer is ...
A) 0.738 B) 0.607 C) 0.598 D) 0.709

30. the mean number of correct answers is ...
A) 0.83 B) 1.20 C) 0.875 D) 1.14
Page 4
31. the probability of guessing exactly two correct questions is ...
A) 0.246 B) 0.161 C) 0.227 D) 0.168

32. The mean of a normal probability distribution is 500 and the standard deviation is 10. About 95

percent of the observations lie between what two values?
A) 490 and 510 B) 480 and 520 C) 470 and 530 D) 450 and 550

[naef95]

مفيد

[بنت ناس وقلبي ألماس]

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