Please help me figure out this distribution question.? The distribution of marks in a statistics exam is approximately normal with mean and standard deviation 17. What should the pass mark be set at if 15% are to fail? If the examiner wishes to grant the top 20% A's, what should be the...

A local beer producer sells two types of beer, a regular brand, and a light brand with 30% fewer calories. The company's marketing department wants to verify that its traditional approach to appealing to local white-collar workers with light beer commercials and appealing to local...

find the probability that a randomly selected adult has an IQ between 90 and 100. Assume that the mean of scores is 100 and a standard deviation of 15.

determine which level of measurement is the sample of spheres categorized from sofest to hardest.

Please show me the step by step process for the following. I'm not allowed to use a calculator on tests. So I need to understand how to do this without one. I need to show how I got the answer when I test on this stuff. I don't have mathematical software. A mandatory competency test...

Please show all work, no calculator allowed so I understand process. Assume that the mean systolic blood pressure of normal adults is 120 millimeters of mercury (mmHg) and the standard deviation is 5.6. Assume the variable is normally distributed. A. If an individual is selected, find the...

Please show a detailed process how answer was deduced. A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business dinners was $6.12 and the variance of 12...

in a procedure, a random sample of 8 gear boxes are removed from the inventory pool of components and are checked for manufacturing defects. historically, only 5% of the gear boxes have such flaws. what is the probability that hooper's sample contains no gear boxes with manufacturing flaws?

The director of quality for Harley Davidson is conducting his weekly spot check of the transmission gear box of the newly introduced Wind Phantom series motorcycle. In this procedure, a random sample of 8 gear boxes are removed from the inventory pool of components and are checked for...

A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and = 0.01. What are the critical values? A) 10.196 and 41.638 C) 9.262 and 44.181 B) 9.886...