Exercise 3.72. in a lumberjack competition a contestant is blindfolded and spun around 9 times. the blindfolded contestant then tries to hit the target point in the middle of a horizontal log with an axe. the contestant receives 15 points if his hit is within 3 cm of the target, 10 points if his hit is between 3 cm and 10 cm off the target, 5 points if his hit is between 10 cm and 20 cm off the target, and zero points if his hit is 20 cm or more away from the target (and someone may lose a let y record the position of the hit, so that y = y > 0 corresponds to missing the target point to the right by y cm and y = −y < 0 corresponds to missing the target to the left by y cm. assume that y is normally distributed with mean μ = 0 and variance 100 cm2. find the expected number of points that the contestant wins.

Which equation is true? i. 56 ÷ 4·7 = 82 ÷ (11 + 5) ii. (24 ÷ 8 + 2)3 = (42 + 9)2 neither i nor ii ii only i and ii i only

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.