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The probability that no defects are found in a batch selected from production line A is .99, and the corresponding probabilities for production lines B and C are 0.97 and 0.92, respectively
A simple random sample of 10 software widgets are chosen for installation. If 10% of this type of software widgets have connectivity problems, find the probability of each of the following events.
Using the CV, compare the variability of the two items. Suggest reasons for any differences
The mean score of a college entrance test is 500; the standard deviation is 75. The scores are normally distributed. What percent of the students scored below 320?
A manufactured battery is defective with the probability of 5%.In a lot of n=200 batteries, approximate the probability that at most 12 car batteries are defective.
What is the area under the normal curve between z = -1.0 and z = -2.0?
A researcher wishes to estimate the percentage of adults who support aboloishing the penny. What size sample should be obtained if he wishes the estimate to be within 4 percentage points with 95% co
Given a population with a mean m of 75 and a standard deviation of 15, what is the z-score for the following values?
What makes the standard normal distribution different from other distributions?
Using the standard normal table, find the proportions for the areas listed below
Two cards are drawn from a well-shuffled deck. What is the probability that they form a blackjack (i.e. one is an ace and the other is a ten, jack, queen, or king)?
Calculate the probability that a specific bus (say, line 34) passes from the bus stop in the next 10 minutes. Then, calculate the probability that the mean of all the buses is less than 10 minutes.
With what instrument could the predictive validity of a metric scale (a set of questions) best be determined?
Scores on a certain test are normally distributed and a researcher wishes to estimate the mean score achieved by all students on the test. He was told that he would need a sample size of 100 to assu
On average how much difference should exist between the population mean and the sample mean for n = 4 scores randomly selected from the population?
If the 80% of the connectors are kept dry and 20% are wet what proportion of the connectors fail during the waranty period.
The number of patients arriving at a medical emergency can be modelled as poisson process with a mean of 25 arrivals per hour. Determine the probability that there are no patients in an interval of
A certain zoo is know to collect "unusual" animals from different animal groups. One ostrich specimen in the zoo weighs 229 kg and one elephant specimen weighs 8150 kg.
Assume every bus in Gainesville follows an exponential distribution with a mean of 7.5 minutes. From a bus stop, we randomly survey 100 different buses (i.e., not of the same line).
The alkalinity level of water specimens collected from the Han River in Seoul, Korea, has a mean of 50 milligrams per liter and a standard deviation of 3.2 milligrams per liter.
A U. S. citizen 15 years of age or older is selected at random. Determine the probability that the person selected is over 64, given that the person does not live with spouse.
A certain brand of phone is supposed to weight 25 grams. We assume that the phone weight follow a normal distribution with the standard deviation off s=3 grams.We buy 4 such phones and compute the m
Let X be normally distributed random variable with mean u and variance s2= 4.84. Determine the the size of the sample required to be 90% confident that the error in the estimation is of u is at most