For the SAT nationally, the mean is 509 and the standard deviation is 103. If a school finds that the mean score is 470 from a random sample of 100 seniors, can they claim that they perform at the national average?

3. mr. sanchez’s class sold fruit pies for $1.65 each and mr. kelly’s class sold bottles of fruit juice for $1.36 each. together, the classes sold 79 items and earned $118.17 for their school. (a) write and solve a system of equations that model the problem. show all your work. (b) which class earned more money? (c) how much more money did that class earn?