# أخواني مساعدتكم في حل مسائل على المات لاب

(system) #1

بسم الله الرحمن الرحيم …

أخواني عندي بعض المسائل وماعرفت أحلهاا على برنامج المات لاب ,

ياليت توضحون لي كيف طريقة حلها .؟ ومششكورين وجزآكم الله ألف خير

المسـآئل …

B A company owns 300 laptops. Each laptop has an 10% probability of not working. You randomly select 20 laptops for your salespeople.[/b]

a) What is the likelihood that 10 will be broken?

b) What is the likelihood that they will all work?
B What is the likelihood that they will all be broken?[/b]

B A study indicates that 10% of American teenagers have tattoos. You randomly sample 30 teenagers. What is the likelihood that exactly n will have a tattoo?
[/b]

هذي على الـ binomial distibution

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السؤال الثاني … على normal probability distribution

Pressure gauges manufactured by Precision Corp. must be checked for accuracy before being placed on the market. To test a pressure gauge, a worker uses it to measure the pressure of a sample of compressed air known to be at a pressure of exactly 200 pounds per square inch. If the gauge reading is off by more than 0.0275% ((11/4)/100))*200, the guage is rejected. Assuming that the reading of a pressure gauge under these circumstances is a normal random variable with mean 200 and standard deviation 5.5, find the percentage of gauges rejected.

الســؤال الثالث : على Expoonentiial density function

Plutonium 239 decays continuously at a rate of 0.00284% per year. If X is the time a randomly chosen plutonium atom will decay, write down the associated probability density function, and use it to compute the probability that a plutonium atom will decay between 100 and 1100 years from now.

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السؤال الرابع : على poisson distrbution

The number of traffic accidents that occurs on a particular stretch of road during a month follows a Poisson distribution with a mean of 20. Find the probability that less than 11 accidents will occur on this stretch of road during a randomly selected month.

السؤال الخامس : على poisson distrbution

A small life insurance company has determined that on the average it receives 20 death claims per day. Find the probability that the company receives at least 11 death claims on a randomly selected day.

الاسئله هذي في مادة الاحصاء , انا عرفت أحلهاا يدويا على حسب المعادلات لكـن مـآعرفت أحلهاا على البرنـآمج ,

أتمنى منكم المسسـآعده في حلهاا وششكررآآآ

(system) #2

افاا ولا رد يـآبشمهندسين ؟ \

اتمنى مساعدتكم ,

#3