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The useful life X of a particular kind of machine is a random variable with density function: f(x)={(2.4/x^2)+1/5 if 3≤x≤6, otherwise 0 where x is the number of years a randomly selected machine stays in use. What is the expected useful life of the machine? (Not 1)
Derrick scored an 80 on both tests. Julie scored a 70 on the first test and a 90 on the second. They both totaled 160 points on the two exams, but Julie claims that her total is better. Explain.
Prove that the probability of South's receiving exactly k aces when a bridge deck is divided into 4 hands is the same as the probability that a hand of 13 cards
Suppose you had a student telephone directory for your local college and wanted to sample 100 students.
Write a program to calculate students average test scores and their grades - a method to read and store data into two arrays, a method to calculate the average test score and grade and a method to output the results.
The heights of 5-year-old boys are Normally distributed with a mean of 43 inches and standard deviation of 1.5 inches.
What kind of a study is this?- What do you conclude? Support your conclusion by testing an appropriate hypothesis.
American sports fans often complain about the lack of scoring in soccer. In particular, many Americans feel that scoreless ties occur way too often.
A large sample of students was surveyed at a particular university. Among other things, they were asked to report their weight, and how many minutes
The FAA is conducting a study to determine if the mean flight experience of newly hired pilots has decreased. State the null and alternative hypotheses in terms of the population mean μ.
The station is now in the middle of a program break. What is the probability that the switchboard will be overloaded during the next minute?
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
write out explicitly using bernoullis techniques the formulas for the sums of the first n fourth fifth and tenth
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