The dog’s leash is 60 inches long. If the dog walks back and forth with its leash pulled tight while the leash is tied to the light post, it will walk in part of a circle. If the dog’s leash rotates through 150° , how far does the dog walk ?
Arc Length=

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”?