Part 1 complete discussion
Describe a situation where you see probabilities or might see probabilities. Then present this probability as a conditional probability. In response, other students can make assumptions about the conditional probability table that could accompany such a situation and pose a question for a specific probability. Finally, a third student can show the work of solving the probability. Your first post should start a new probability discussion only!
Part 2 reply to discussion
Hi everyone!
Question 16: Dorothy Little purchased a mailing list of 2000 names and addresses for her mail order business but after scanning the list she doubts the authenticity of the list. She randomly selects five names from the list for validation. If 40% of the names on the list are non-authentic, and x is the number on non-authentic names in her sample, the expected (average) value of x is ____.
Answer: 2.00
Explanation: The problem states that 40% of the names on the list are non-authentic. If Dorothy selects 5 names randomly, we can expect 40% of those names to be non-authentic. To calculate the expected value of x, we multiply the probability of a name being non-authentic by the total number of names selected: the expected value of x = (0.40) x (5) = 2.00
Thank you!
Part 3 reply to discussion
It is known that 20% of all students in some large university are overweight, 20% exercise regularly and 2% are overweight and exercise regularly. What is the probability that randomly selected student is either overweight or exercises regularly or both?
We get to the solution of 0.38 by using the formula 20+20-2=0.38
Part 4 complete discussion
When trying to determine probabilities, one must first assess whether the variable would have a normal distribution. Using the tools from this course, what are some methods that could be used to determine whether a variable has a normal distribution?
