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The life expectancy of a common brand of battery is normally distributed with a mean of 400 hours and a standard deviation of 120 hours. What is the probability a randomly selected battery will last at least 300 hours?
A fair coin is flipped 3 times. Compute the odds of flipping 3 tails.
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
Gas station sells 1400 gallons of gasoline per hour if it charges $ 2.05 per gallon but only 1100 gallons per hour if it charges $ 2.95 per gallon. What should gasoline price be to sell 1000 gallons per hour?
In a survey about satisfaction with local phone service, those respondents who rated their current service as excellent and those who rated it Poor-Very Poor were asked to classify their current local service provider. The results are given in the..
You can allow the cup to overfill 10% of the time. What amount should you set as the mean amount of coffee to be dispensed?
Estimated proportion is within 2.5 percentage points of the true proportion. A previous poll suggests that the proportion is 85%. How large must your sample be?
Determine the special property of standard normal distribution, compared to other normal distributions?
For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
Draw a back-to-back stem-and-leaf plot, with drug users on the right and discuss similarities and differences between the two data sets. There should be three things you look at when comparing these - location, variation, and general shape.
What shape curve do you get when your data set has the mean, median, and mode all with the same value? Could the value of the sample mean and the value of the population mean ever be the same?
A pH level of the soil between 5.3 and 6.5 is optimal for strawberries. To measure the pH level, a field is divided into two lots. In each lot, we randomly select 20 samples of soil.
Develop forecasts for the years 6 through 13 using a 5-year moving average and Weight the most recent year by 6, the previous year by 4, the year before that by 2, and the other years by 1.
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