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Assume that students who took the SAT math exam were normally distributed about a mean value of 580 with a standard deviation of 60. Determine what percentage of the students scored higher than 750 on the exam.
Statistics and Probability, Statistics
XYZ Corporation's budgeted monthly sales are $10,000, and they are constant. Its customers pay as follows: 30% pay in the first month and take the 2% discount, while the remaining 70% pay in the month following the sale ...
A student must answer 15 true/false questions for a test, but the student did not study well. If the student randomly guesses on each question , what is the probability that the student answers 3 questions correctly?
A factory makes parts for laptop computers, including screws. The screws are required to have the right length. The lengths of the screws obey a normal distribution with mean μ=4.25 millimeters and standard deviation σ=0 ...
1) Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the qua ...
A political researcher wants to determine if there is an association between gender (male, female) and political party affiliation (Democrat, Republican, Independent). What type of statistical test should be used?
A 36-year maturity bond with par value $1,000 makes semiannual coupon payments at a coupon rate of 14%. What is the EQUIVALENT annual yield to maturity of the bond if the bond sells for $1,080? A 31-year maturity, 9.5% ...
1. To investigate the ecological impact of parasite infections, scientists measured the distance that infected western fence lizards, Scelopons occidentalis , ran in two minutes against a control group of uninfected liz ...
The number of accidents in a day in town A is given by X , and the number of accidents in a day in town B is given by Y . The joint probability function for X and Y Y is f ( x , y )=964 x ! y ! for x =0,1,2,3 an ...
What is the probability that a randomly selected person will have a birthday in November? Assume that this person was not born in a leap year. Express your answer as a simplified fraction or a decimal rounded to four dec ...
You randomly sample 50 theaters in the United States. You ask those theaters how much they charge for a large popcorn, and you get a sample mean of $6. Then, you make confidence interval using this data with the lower li ...
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