Glucose testing, continued. shelia’s measured glucose level one hour after having a sugary drink varies according to the normal distribution with μ = 122 mg/dl and σ = 12 mg/dl. what is the level l such that there is probability only 0.05 that the mean glucose level of four test results falls above l? (hint: this requires a backward normal calculation. see page 91 in chapter 3 if you need to review.)