Mr. zuro finds the height of all 15 students in his statistics class to be 69.0 inches. just as mr. zuro finishes explaining how to get the mean, danielle walks in late. danielle is 70.6 inches tall. what is the mean height of the 16 students in the class?

How to do this , and can some one explain

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.