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A lock on a bank vault consists of three dials, each with 30 positions. In order for the vault to open, each of the three dials must be in the correct position. a. How many different possible dial combinations are there for this lock? b. What is the probability that if you randomly select a posi- tion on each dial, you will be able to open the bank vault? c. Explain why "dial combinations" are not mathematical combinations expressed by Equation (4.14).
a box contains 15 red discs and 5 black discs. a disc is selected at random and its color noted. the disc is then
Find the probability that in a given month a) there are exactly 9 days with 0.01 inch or more precipitation, b) there are at most 9 days.
Can anyone explain? Age so individuals in a certain population are normally distributed with a mean of 55 and standard deviation of 10 years. What age reange would make up the youngest 5% of the population?
A graphical presentation may accomplish ALL BUT which of the following objectives? Illustrate the amount of variation in the data.
At the 0.01 level of significance, can the student group conclude that there is a difference in average textbook prices for new textbooks sold on campus and over the Internet?
The following data shows the packages gathered for delivery for ten days and the proportion of packages received not delivered to the customers at expected time.
question sadistic tendenciesyou are captured by a russian spy and tortured for information. every time you fail to
A histogram of time spent eating & drinking each day is skewed right. Use this result to explain why a large sample size is needed to construct a confidence interval for the mean time spent eating & drinking each day.
Using the paired t test because the samples are correlated with each other could be another avenue. This would help us find the p-value and look at the statistical significance in evaluating the quality of care or outcomes in a medical home.
a researcher is interested in determining the proportion of first year university students who have suffered hearing
The firms are actually violating at least one regulaltion, what is the pmf of the number of firms visited by the inspector that are in violation of at least one regulation?
in order to estimate the average electric usage per month a sample of 196 houses was selected and their electric usage
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