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
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?
هذي على الـ binomial distibution
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.
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