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A multiple-choice test consists of 12 questions with 4 possible answers to each question. In how many ways can the test be completed?
In an experiment, die is rolled continually until a "6" appears, at which point the experiment stops. What points of the sample space are contained in "En"?
A study of a company's practice regarding the payment of invoices revealed that an invoice was paid an average of 20 days after it was received. The standard deviation equaled five days. Assuming th
For a resturant survey, a college student, employed by the company, asked the college-aged students in cool clothes walking by their opinion of the salad offerings at the restaurant.
What is the probability that 4 randomly selected adult americans have not visited a casino in the past 12 months?
The mean of a normally distributed group of weekly incomes of a large group of executives is $1,000 and the standard deviation is $100. What is the z-score for an income of $1,100?
What is the proportion of the total area under the normal curve within plus and minus two standard deviations of the mean?
At a local middle school, 60% of students are enrolled in choir or band. If a random sample of 5 students is taken, what is the probability that all 5 students are in choir or band?
Samples of 10 seats of each type (A, B, C) were selected and given the safety test. The scores are given below. Is one seat safer than another or are they all about equal in terms of safety? A.
The mean score of a college entrance test is 500; the standard deviation is 75. The scores are normally distributed. What percent of the students scored below 320?
Suppose X~N(0,1)and Y ~N(2,2),(that is ,EY =2 and Var(Y)=2) and X and Y are independently distributed. Find P{X is less than or equals to Y }.
What is the area under the normal curve between z = 0.0 and z = 1.79?
Which of the following is NOT true regarding the normal distribution?
Assume that the average annual salary for a worker in the United States is $32,500. What percentage of Americans earn below $21,000?
Question: Find the probability that in 200 tosses of a fair die, we will obtain at least 40 fives.
Mr. and Mrs. Jones live in a neighborhood where the mean family income is $45,000 with a standard deviation of $9,000. Mr. and Mrs. Smith live in a neighborhood where the mean is $100,000 and the st
From the following stem-and-leaf display, find the minimum value, the 1stquartile, the median, the 3rdquartile, and the maximum value. List and interpret the interquartile range.
Assuming that the food costs are normally distributed, what is the probability that a family spends less than $410 per month?
Suppose that a financial analyst wants to evaluate the variability of the prices of a new stock in the market. The analyst collects closing stock prices of new stock issues: 15, 14, 19, 16, 11, 14,
The annual incomes of Unique, another firm similar to Elly's Industries, were also studied and found to have a mean of $38,900 and a standard deviation of $6,612. What company has the greater coeffi
In a suburban area, past records revealed that 50 percent of all the high school graduates go to college. From 20 graduates selected at random, what is the probabililty that exactly 8 will go to c
a. Run a linear regression of HP on MI, R and V and obtain a regression summary output. b. What is the equation of the regression line?
A study of the net sales of a sample of small corporations revealed that the mean net sales is $2.1 million, the median $2.4 million, the modal sales $2.6 million and the standard deviation of the d
5% of car made at plant A have a malfuction. what is the probability that the car was manufactured at plant A and has a defect?
a. Interpret the slope in the context of the problem. b. Evaluate the overall fit of the model.