| n = 12, r = 3, p = 4/9, q = 1 - (4/9) = 5/9 | |
| x | P(x) = C(n, x) p^x q^(n - x) |
| 0 | 0.171 |
| 1 | 0.412 |
| 2 | 0.329 |
| 3 | 0.088 |
Find the standard deviation of Pandoi vallabie 5. A software package consists of 9 programs, 4...
Find the distribution law oi te a 6. A software package consists of 11 programs, 7 of which must be upgraded. 5 programs are needn't be upgraded among chosen. randomy chosen for testing. Construct the distribution law for the number of programs that bilitu donsity function:
5 A sotware package consists of 9 programs, 4 of which must be upgraded. 3 programs are randomiy dhosen for testing Construct the distribution law for the number of programs that must be upgraded among chosen. 6. The distribution law of random variable X is given 01 04 03 02 Find the variance of random variable X 7. Let X be a continuous random variable whose probability density function is: 2x3+ax2, ifx E (0; 1) if x (0;1) f(x) 0,...
A normal population has mean = 9 and standard deviation -5. (a) What proportion of the population is less than 19? (b) What is the probability that a randomly chosen value will be greater than 4? Round the answers to four decimal places. Part 1 of 2 The proportion of the population less than 19 is Part 2 of 2 The probability that a randomly chosen value will be greater than 4 is : A normal population has mean =...
1. A population has a mean of 60 and a standard deviation of 30. Samples of size 16 are randomly selected. Calculate the standard deviation of the sample distribution X. 2. Samples of size 16 are drawn from a population. the sampling distribution for X has a standard deviation of 0.25. Find the standard deviation of the population. 4. Tires are found to have a mean life of 40,000 miles. The standard deviation is 8000. A sample of 400 is...
1. Find the mean, the variance and standard deviation. The number of dogs per household in a small town. Dog: 0, 1, 2, 3, 4, 5 P( x): 686, 195, 077, 022, 013. 007 2. Score (x): 1, 2, 3, 4, 5 Frequencies: 24, 33,42, 30, 21 A. Construct a discrete probability distribution B. Find the mean, the variance and the standard deviation.
3. From past experience, it is found that the number of typing errors made by Mary follows a Poisson distribution. The probability that there are no errors made on a randomly chosen page is 0.7788. (a) Find the mean and the standard deviation for the number of mistakes made on a page. (b) Determine the expected number of mistakes made on 8 randomly chosen pages. [3] (c) If 20 pages were randomly chosen, find...
7. The EverGreen Salad company asserts that on average its packaged salad greens remain fresh for 4 days after the "use by" date on the package, with a standard deviation of 0.45 days. Assume that the length of time a package of greens stays fresh after the "use by" date is normally distributed. a) What is the probability that a randomly selected package of greens will be fresh for more than 5 days after the "use by" date on the...
0.54. Find the probablty a 5. Two independent random variables X and y are given with their distribution laws Xi 0.5 1 Pi 0.2 0.8 Yi 2 0| 2 Pi 0.3 0.4 0.3 Find the distribution law of the random variable W 4X-Y. fuhich must be upgraded. 5 programs are
A large playlist consists of songs with times which have mean 4 minutes and standard deviation 10 seconds. a.) A simple random sample of 64 songs is selected. What is the mean of the total length of the 64 songs, in minutes? 256 ER! 以前的尝试 RÉJITED 159-9066 b.) If as above 64 songs were randomly selected, what is the standard deviation of the total length of the songs, in minutes? (Give decimal answer to two places past decimal.) 1.3300 ES!...