The number of daily customers at the Good Eats Diner for one week was 70, 68, 110, 65, 90, 125, and 105. What is the standard deviation of the data?

A. 21.9

B. 25

C. 90

D. 90.4

Part a : solve - vp + 40 < 65 for v . part b : solve 7w - 3r = 15 for r show your work!

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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”?