1. The marks in a chemistry course have a mean of 79 and a standard deviation of 12. The marks in a biology course have a mean of 70 and a standard deviation of 18. Emmanuelle has a mark of 90 in both classes. Which mark do you consider to be a higher grade?
2. Researchers have observed that regular smokers have an average lifespan that is normally distributed and is 68 years with a standard deviation of 10 years. What percent of smokers will live beyond age 76?© BrainMass Inc. brainmass.com October 10, 2019, 1:47 am ad1c9bdddf
(1) z = (x - μ)/σ
For Chemistry, z = (90 - 79)/12 = 0.9167
For Biology, z = ...
This solution provides the steps for solving the given consumer mathematics word problems.