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On a true-false test, the score is often computed by subtracting the number of wrong answers from the number of right ones and converting that number to a percentage of the number of questions. What is the expected score on a true-false test graded this way of someone who knows 80% of the material in a course? How does this scheme change the standard deviation in comparison with an objective test? What must you do to the number of questions to be able to be a certain percent sure that someone who knows 80% gets a grade within 5 points of the expected percentage score?
A ... is a rectangular array of numbers that are enclosed within a bracket . horizontal set
If an arrow is shot upward on the moon with a velocity of 58 m/s, its height (in meters) after t seconds is given by H = 58t - 0.83t^2.
Find the exponential growth function and what will the population be after 7 days - explain the variety of ways to solve the problem.
A random sample of 50 employees at a company was obtained. The one-way distance from home to work was recorded for ach employee in the sample. Suppose the mean of the sample was 15.2 miles and the standard deviation was 4.2 miles.
A cylindrical container 1.7 {rm m} tall contains mercury to a certain depth, d. The rest of the cylinder is filled with water. If the pressure at the bottom of the cylinder is two atmospheres, what is the depth d?
A helicopter landing Zone needs to be a circular area that gives 10 extra feet on any side of the helicopter blades as one of the helicopters blades is 8.7 feet long find the area of the landing Zone to the nearest square foot
1) What is the equation of the line that passes through the points (2, 5) and (6, 3)? 2) What is the equation of the line containing point (5, 6) and has slope m = 3? 3) Solve the inequality 5x-2?4+3x
A rectangular box is to have a square base and a volume of 40 ft3. If the material for the base costs $0.30 per square foot, the material for the sides costs $0.05 per square foot
A spring has a natural length of 26 cm. If a 25 N force is required to keep it stretched to a length of 39 cm, how much work W is required to stretch it from 26 cm to 28 cm? (Round your answer to the nearest hundredth.)
Find the center of mass of the lamina that has the given shape and density. Be sure to enter the ordered pair as (xcm,ycm) where both points are rounded to the tenths place and the parentheses included.
If investors invests $10,000 for one month in a company whose stock either goes up by 80% after a month with probability 1/2 or drops 60% with probability 1/2.
an oil company distibutes oil in a metal shaped like a cylinder that has an actual radius of 5.1 cm and a height of 15.1 cm. A worker incorrectly measured the radius as 5 cm and the height as 15 cm. Determine the relative error in calculating the ..
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