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Employees at a large computer company earn sick leave in one-minute increments depending on how many hours per month they work. They can then use the sick leave time any time throughout the year. Any unused time goes into a sick bank account that they or other employees can use in the case of emergencies. The human resources department has determined that the amount of unused sick time for individual employees is uniformly distributed between 0 and 480 minutes. Based on this information, what is the probability that an employee will have less than 20 minutes of unused sick time?
The lifetime of a color television picture tube is normally distributed with the mean of 7.8 years and a standard deviation of 3 years.
The kinds of statistical methods that were used to formulate the author's argument.
Heights of college-aged women are approximately bell-shaped and symmetric, with almost all of them (95%) falling between 58" and 72". Find the approximate values of the mean and standard deviation.
Assume that the histogram of the data is approximately bell-shaped. Approximately how many of the 260 students had sleep times between 355 minutes and 455 minutes per night?
The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the des..
Develop a spreadsheet model to determine the optimal number of magazines to order each day. Use 500 replications and round the demand values generated by the normal random number generator (RNG) to the closest integer value.
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
The standard deviation in the 12-month earnings per share for 10 companies in the airline industry was 4.27 and the standard deviation in the 12-month earnings per share for 7 companies in the automotive industry was 2.27
Assuming that the data is normally distributed and the sample size is greater than 30, calculate the critical values for a two tailed and a one-tailed test when alpha = 0.05
The distribution of diastolic blood pressures for the population of female diabetics between the ages of 30 and 34 has an unknown mean μd and a standard deviation σd = 9.1 mm Hg.
Explain how probability is used in that situation. Identify the type of probability your example best fits by explaining whether it is an independent event or dependent upon something else.
The radius of the hole and the radius of the shaft. Let the random variable X denote the clearance, in millimeters. The probability density function of X is?
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