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The weekly earnings of bus drivers are normally distributed with a mean of $395. If only 1.1% of the bus drivers have a weekly income of more than $429.35, what is the value of the standard deviati
A population has a normal distribution with a mean of 98 and a standard deviation of 12. If 9 measurements are randomly selected from this population, what is the probability that the sample mean wi
Develop a 95% confidence interval to estimate the difference in SAT math scores from students in Delaware and New jersey.
Collete is self-employed, selling stamps at home parties. She wants to estimate the average amount a client spends at each party. A random sample of 35 clients' receipts gave a mean of $34.70 with s
Syracuse Roadbuilding Company is considering the purchase of a new tandem box dump truck. The truck costs $95,000, and an additional $5,000 is needed to paint it with the firm logo and install radio
Assume a steady smoker spends on average $20 with a standard deviation of $5 per week on cigarettes. What is the probability that a sample of 100 steady smokers spend between $19.50 and $21?
Susan is cutting an album. The songs on the album are 4.35, 4.43, 3.42, and 3.35 minutes long. What is the mean and standard deviation of these songs?
Let x denote the time it takes to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at ran
the mean of major student taking the GRE test in 2010 was 1000 with a standard deviation of 230. if you select a random sample of 75 students, what is the probabbility that the mean score is below 9
Suppose that the lifetimes of TV tubes are normally distributed with a standard deviation of years. Suppose also that exactly of the tubes die before years. Find the mean lifetime of TV tubes. Carr
What is the probability all four of the selected homes have a security system? (Round your answer to 4 decimal places.)
Construct a 95% confidence interval estimate of the population mean amount in the bottles.
suppose you want to test the claim that mu!=3.5 with standard deviation unknown. Given a sample size of n = 40 and a level of significance of alpha=.05, when should you reject H0 ?
Determine the value of the relevent test statistic and the corresponding p-value.
A candidate is automatically hired if she learns the computer system in less than 100 minutes. A cut-off time is set at the slowest 10% of the learning distribution. Anyone slower than this cut-off
SAT verbal scores are normally distributed with a mean of 401 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lie between 310 and 492.
What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test (to 4 decimals
Of those mountain climbers who attempt Mt. McKinley, only 65% reach the summit. In a random sample of16 mountain climbers who are going to attempt Mt. McKinley, what is the probability of each of the
One group of students studie20 minutes a day for 1o days. the second group study once at the end of the coures but for 200 minutes. what is a onetial test?
what is the probability that the auditor will find that the sample proportion (P) of the accounts in error will exceedd 0.10?
Find the probability that a randomly selected bolt can be used (either immediately or after being cut). Find the probability that fewer than 15 out of 20 bolts can be used.
Obtain the z-score and T-score for EACH student. Show your calculations. Who did better on the test? How many standard deviation units is each score from the mean? Compare the results of the three s
The Bureau of the Census reported that the farm population dropped from 30.5 million in 1940 to 6.5 million in 1999. What is the index for 1999 based on 1940?
Sue and Jim approached the machine first. They both said they wanted red gum balls. What is the likelihood they will get their wish?
Using your simulation results calculate an estimate of the probability that the sum of the dice is 10 and the player is dealt three cards that can be put in sequence (Be careful. Aces are assumed to