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Determine the area under normal curve to the left of z= -1 plus the area under normal curve to the right of z=1 . The combined area is? Round to four decimal places if needed
X represents the number of occurrences in the five-minute period. Supposing the number of occurrences remains constant over any two five-minute periods. The mean in five minutes is 2.9,
The following machine breakdown probabilities per month is: 0 -.10, 1 -.20, 2 -.30, 3 -.40, 4 -.00. What is the expect number of machine breakdowns per month?
Compute the approximate average income of the respondents. Compute the approximate variance and standard deviation of the incomes of the respondents.
Chance of winning $100 or more on a kind of casino slot machine is 2.3%, when playing the maximum bet for one hour. A couple enters casino and each plays these machines for an hour. Determine the ch
Compute the z-score for the house that sells for $310,000. Using the empirical rule, find out the range of prices that includes 95% of the homes around the mean.
Is this sufficient evidence to support airline spokesman's claim? Test using a significance level of 0.05. Discuss Estimate the proportion of bags which fail to arrive at the proper destination using
A set of final exam scores in organic chemistry course was found to be normally distributed, with the mean of 73 and standard deviation of 8. Determine the probability of getting a score higher than
Develop a 95% confidence interval for the proportion of U.S. adults who believe that it wouldn't make a difference which party is in power.
Determine the probability that both companies become profitable? Determine the probability that neither company becomes profitable? Determine the probability that at least one of the two companies bec
What is the probability that a randomly chosen blood donor is type O? A recipient with type A blood may safely receive blood from a donor whose blood does not contain the B antigen. What is the proba
(a) Find the average time until you get the flu shot after it is available. (b) Find the standard deviation of time until you get the flu shot after it is available. (c) What is summation of Yi?
A box contains 4 one-dollar bills and 3 five-dollar bills. You select six bills at random and without replacement from the box. Let T be the amount you get. What is Var(T)?
A university recruiter would like to find out the proportion of high school students who plan to apply for financial aid when attending college. She surveys 114 current high school seniors who plan
Determine how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, have the following properties:
A large number n of blood samples are to be screened for HIV. Testing each and every sample separately needs n tests. Pooling half of each sample needs one test if all samples are free from HIV,
A slot machine has three slots; each will show cherry, a lemon, a star, or a bar when spun. The player wins if all three slots show same three items. If each of four items is equally likely to appea
If we suppose nothing regarding the shape of the distribution, approximately what percentage of all such tires will last between 25,000 and 37,500 miles?
In an Statistics class, 70% of students are ME majors, 12% are EE majors, and 18% are CEE majors. On certain day, 23% of the ME majors, 80% of EE majors, and 50% of CEE majors attend class. If I cal
Suppose normal distribution. To be more customer-friendly, the manufacturer has decided to change its warranty policy so the probability of service while under warranty is 0.03 or less. How many mo
The manufacturer's warranty for watch is 1 year (12 months). Suppose normal distribution. What is the probability watch will function for 25 months or longer?
Childhood participation in sports, cultural groups, and youth groups appears to be related to enhanced self-esteem for adolescents (McGee, Williams, Howden-Chapman, Martin, & Kawachi, 2006). In
The mean time it takes for specific make/model of watch to break down and need repair services from manufacturer is 30 months, with a standard deviation of 8 months. The manufacturer's warranty for
The time between failures for the industrial machine is exponentially distributed with mean of 37 days. Determine the probability that it will be 65 days or longer before the machine breaks down?
The time between failures for an industrial machine is exponentially distributed with a mean of 37 days. What is the probability that a failure occurs in the next 30 days?