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Customers at a gas station pay with a credit card (A), debit card (B), or cash (C). Assume that successive customers make independent choices with P(A) = 0.5, P(B) = 0.2, and P(C) = 0.3. (a) Among t
The proportion of all items classified as "not high sodium" is three times the proportion of all items classified as "high sodium". Calculate the probability that an item is both high fat and high
An urn contains 9 colored balls: 4 orange and 5 blue. Two balls are selected at random without replacement, and you are told that at least one of the balls is orange. What is the probability that b
What is the probability that one randomly selected Rayovac battery will have a test life between 20.6 and 21.4 hours?
A study of Machiavellian traits in consultants was performed. The consultants were then classified as having dishonest, neutral, or honest Mach rating scores. The researcher investigated the impact
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the mana
Calculate the variance and the standard deviation of this probability distribution? Calculate the expected rate of return?
An order for an automobile can select the base model or add any number of 11 options. The random variable is the number of options selected in an order. Determine the range (possible values) of the
The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown. However, records indicate that the mean time is 11.3 minutes, and the standard
Suppose a geyser has a mean time between eruptions of 76 minutes. Let the interval of time between the eruptions be normally distributed with standard deviation 27 minutes. (round everything to fou
Let Y1 and Y2 be independent Poisson random variables with means ?1 and ?2, respectively.
The probability of winning the local gas stations "Tigerama" game is 0.001. A women is determined to win. What is her probability of winning if she goes to the gas station exactly 100 times?
Suppose X has a poision distribution with a mean of .4. Determine the following probabilities:
Determine the mean and standard deviation of the random variable X. (round to nearest penny).
What is the probability that a sample of 50 female grads will provide a sample mean within $.50 of the population mean, $18.80? What is the prob. that a sample of 120 female graduates will provdie a s
Suppose that the distribution of net typing rate in words per minute (wpm) for experienced typists can be approximated by a normal curve with mean 54 wpm and standard deviation 15 wpm. (Round all an
1. A random variable has possible values of 20, 21, 22, 23, and 24 that are equally likely to occur. a) What is the probability that the random variable is less than 23? b) What is the mean of the ran
Suppose a geyser has a mean time betwen eruptions of 83 minutes. Let the interval of time between the erupitons be normally distributed with standard deviation 24 minutes.
Construct a stem-and-leaf plot for these data. Arrange the leaves for each stem in increasing order. What is the shape of the stem-and-leaf plot, symmetric, skewed to the left or skewed to the right?
What is the expected number of trees sold in the month of December? What is the standard deviation of the number of trees sold in the month of December?
In a recent survey, ten percent of the homes in Montana were found to own a Miley Cyrus action figure. In a sample of ten homes:
A system is composed of eight independent subsystems. Each subsystem operates 95% of the time. What is the probability that all the subsystems are operating at any random point in time?
Fatal errors that require a system reboot occur an average of 7 times per week. (The system runs 24 hours a day, 7 days a week.) The number of fatal errors can be adequately modeled by a Poisson dis
The claim that the proportion of adults who smoked a cigarette in the past week is less than .30, and the sample statistics include n=1093 subjects with 350 saying that they smoked a cigarette in th