Posted - 11/07/2011 : 19:47:58 1. Among companies doing highway or bridge construction, 80% test employees for substance abuse (based on data from the Construction Financial Management Association). A study involves the random selection of 10 such companies.

A) Find the probability that exactly 5 of the 10 companies test for substance abuse. ________________________________

B) Find the probability that at least half of the companies test for substance abuse. ________________________________

C) For such groups of 10 companies, find the mean and standard deviation for the number (among

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royhaas

Posted - 11/09/2011 : 10:05:29 Start by reading the section in your textbook about the binomial distribution. There is probably a table as an Appendix you can use to calculate probabilities.