Janet, an experienced shipping clerk, can fill a certain order in 9 hours. Bill, a new clerk, needs 10 hours to do the same job. Working together, how long will it take them to fill the order?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

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”?

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%