7: The weights, in pounds, of a group of dogs are:

8, 14,26,56, 72,90.

Calculate the standard deviation.

7: 7. The weights, in pounds, of a group of dogs are:

8, 14,26,56, 72,90.

Calculate the standard deviation.

2: Assume that a set of test scores is normally distributed with a mean of 480 and a standard deviation of 20. About what percentage of scores lies between 440 and 480?

(50 ) mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.