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Individual truck drivers are either male or female. In the US 5% of all truck drivers are women, 95% are men. Suppose 20 US truck drivers are randomly selected to be interviewed about their pay.
a.What's the probability that fewer than 2 of the randomly selected truck drivers are women?b.What is the expected number of women in a random selection of 20 truck drivers?
To select a _________ sample, an intact group of subjects that represent the population is selected.
The sales of Lexus automobiles in the Detroit area follow a Poisson distribution with a mean of 3 per day. What is the probability that for five consecutive days at least one Lexus is sold?
There is a probability that the river will flood next year. Riverside's profits for the coming year depend on whether Laura buys the flood insurance and whether the river floods.
A sample of 20 is taken, resulting in a mean of 16.45 and standard deviation of 3.59. Assume that x is normally distributed and used alpha of 0.5 to test hypotheses.
The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
Comparing Computer Results. Refer to the Minitab display below. The probabilities were obtained by entering the values of n=6 and p = 0.0167.
Month is uniformly distributed between 2 and 12. Find the probability density function and the cumulative distribution function of x.
Create a 99% confidence interval for mean overall duration of symptoms in population of individuals who used zinc lozenges.
Airlines must be careful about the total weight of baggage carried by a plane on a commercial flight. Passengers with items exceeding the maximum single-item weight (usually about 70 pounds) must pay a fee
This result prompts a test administrator to claim that standard deviation for eighth graders on examination is less than 29.At a = 0.10, is there sufficient evidence to support administrator's claim?
Select a US citizen and a citizen of China at random, independently of one another. Determine the probability that both have type O blood?
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