Scores on a university exam are Normally distributed with a mean of 78 and a standard deviation of 8. The professor teaching the class declares that a score of 70 or higher is required for a grade of at least "C."
Using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least "C"?
The scores on the Wechsler Adult Intelligence Scale are approximately Normal with μ = 100 and σ = 15.
The proportion of adults with scores between 80 and 120 is closest to?