Consider the quadratic equation
Choose independently two number B and C at random from the interval [-1,1] with uniform distribution, and consider the quadratic equation x^2+Bx+C=0
Find the probability that the roots
a) are both real
b) are both positive
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An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately normal with mean 530 and standard deviation 80. About what percent of students will score between 370 and 6
From past experience, the pass rate of students has been found to be 70%. if students have just been selected at random. what is the probability that at least half of them will fail?
The mean and standard deviation of the sample data of 500 students who took a statistics test were 69 and 7, respectively. The grades have a bell-shaped distribution. Based on this information, which one of the following is the best estimate of th
A furniture store is having a sale on sofas and you're going to buy one. The advertisers know that buyers get to the store and that 1 out of 4 buyers change to a more expensive sofa than the one in the sale advertisement. Let X be the cost of the
The combined scores for females taking the SAT test are normally distributed with a mean of 998 and a standard deviation of 202. If a college includes a minimum score of 1050 among its requirements, what percentage of females do not satisfy that
In testing a certain kind of truck over rough terrain, it is found that 15% of the front wheel tires have a blowout. What is the probability that of the next four trucks tested, at most 3 tires will blowout? What is the expected number of tires th
In a certain manufacturing process it is known that, on the average, 2 in 100 items are defective. What is the probability that 6 items will be inspected before a defective item is found.
From a lot of 10 missiles, 4 are selected at random and fired. If the lot contains 3 defective missiles that will not fire, what is the probability that What is the expected number of missiles that will fire?
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