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Use the normal distribution of SAT critical reading scores for which the mean is 507 and the standard deviation is 114. Assume the variable x is normally distributed.
(a) What percent of the SAT verbal scores are less than 550?
(b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 525?
For the grand opening, an arena has selected 5 finalists, each of whom will win a season ticket located in one of 5 sections: The upper balcony, lower balcony, main floor, courtside, or a luxury box.
Balls that have been thoroughly mixed. Sue and Jim, each, purchased one gumball. What is the likelihood both Sue and Jim get red gumballs?
a study of the attendance at the university of alabamas basketball games revealed that the distribution of attendance
To forecast attendance at an yearly tennis tournament a model has been developed that uses attendance from the previous year and the amount spent for advertising this year.
We wish to determine whether the homicide rate is different in different parts of the country and, if it is different, what is the pattern. We have data on 36 states - 9 each in the four regions Northeast, Midwest, South and West.
The number of children, x, belonging to each of eight families registering for swimming was 2, 2, 2, 4, 2, 1, 2, 2. Find the mean, x. (Give answer correct to 2 decimal places.)
question the data displayed below represents the electricity cost during a recent month for a random sample of 50
a firm is accustomed to training operators who do certain tasks on a production line. those operators who attend the
A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number o..
For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?
A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?
if y1 and y2 are independent and identically distributed normal random varialbes with mean mmu and variance sigma2 find
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