The average GPA of all college students in the United States today
Answer: parameter
Learn More :
STATS
- The percentage rates of home ownership for 8 randomly selected states are listed below. Assuming that the percentage rates follow a normal distribution, construct a 99% confidence interval for the population standard deviation for the percentage rate of home ownership. Interpret your results.
- Ten randomly selected people were asked how long they slept at night. The mean time was 7.1 hours, and the standard deviation was 0.78 hour. Assume that the data is normally distributed.
- The national average SAT score (for Verbal and Math) is 1019. If we assume a normal distribution with sigma = 100, a. what SAT score is in the 85th percentile? b. what is the probability that a randomly selected score exceeds 1200?
- The average age of a vehicle registered in the United States is 8 years, or 96 months. Assume the standard deviation is 16 months. If a random sample of 36 vehicles is selected, find the probability that the mean of their age is between 90 and 100 months.
- The amount of snowfall falling in a certain mountain range is normally distributed with a mean of 70 inches, and a standard deviation of 10 inches. What is the probability that the mean annual snowfall during 25 randomly picked years will exceed 72.8 inches?
- Find the area under the standard normal curve between z = 1.23 and z = 1.90.
- Find the area under the standard normal curve to the right z = 1.92.
- Find the area under the standard normal curve to the left of z = 1.31.
- A fast-food drive-thru serves an average of 5 customers per hour. Find the probability that in the next hour at most four customers arrive.
- A man could complete 3 files a day on an average. Find the probability that he can complete 5 files the next day.
- A test consists of 10 true/false questions. To pass a test, the student must answer at least six questions correctly. If a student guesses on each question, a. What is the probability that the student will pass the test? b. What is the probability that the student answers at least one question correctly
- If the probability that it will rain tomorrow is 0.20, what is the probability that it won't rain tomorrow? Would you recommend taking an umbrella
- At a used-book sale, adult books and children's books are sold. Of the adult books, 70 are nonfiction and 30 are fiction. Of the children's books, 60 are nonfiction and 100 are fiction. If a book is selected at random, a. Find the probability that the book is a children's book. b. Find the probability that the book us nonfiction.
- Andrew asked seven of his friends how many cousins they had. The results are listed below. Find the Mean, Median, Range, Variance and Standard Deviation of the sample data. Round to tenths. 15, 12, 5, 14, 4, 4, 6
- A random sample of 100 subscribers and determine that their mean income is $27,500.