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Typing speed on a new kind of keyboard for people at a certain stage in their training program is approximately normally distributed. The probability that the speed of a given trainee will be greater than 65 words per minute is 0.45.
The probability that the speed will be more than 70 words per minute is 0.15. Find the mean and the standard deviation of typing speed.
Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. In a study of American college students, Rozin, Bauer, and Catanese (2003) examined the importance of food as a source of pleasure versus concerns a..
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 40 th percentile.
what is the probability that a randomly selected value from the distribution will be greater than 2.1 standard deviations avoe the mean?
Find the 75th percentile for the distribution of men's weights. What is the probability that a randomly selected man weighs more than 200 lbs?
trowbridge manufacturing produces cases for personal computers and other electronic equipment. the quality control
Suppose that on a 100-point test, the goal is for the students' exam scores to have a standard deviation of less than 10 pts. A recent sample of 22 exams has a standard deviation of 12.1. Use alpha = 0.05.
Employer wishes to interview only those applicants who score in top 15%. What must cut-off score be for interviews?
To forecast future cigarette sales, the last four years' quarterly sales were recorded in the Excel file Tute10-Q1.xls. Calculate the 3-quarter and 5-quarter moving averages. Show the relevant graphs. Interpret the results. Compute MAD and SSE for ea..
would changing the asset definition in the conceptual framework to one concerned with property rights have any other
Analysis of the data shows a standard deviation of 0.61 minutes. At the 0.05 level, test whether the standard deviation of usage times for this bank's customers might actually be less than the amount predicted at the regional meeting.
You are appraising the quality of diamonds for your importer. A diamond without a clear center (opaque center) shall be downgraded and sold at discount.
suppose that two random variables x and y have a joint density function given by fxy and by checking we find that fxy
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