Find the critical values
χ2l=χ21−α/2 χ l 2 = χ 1 − α / 2 2 and χ2r=χ2α/2 χ r 2 = χ α / 2 2
that correspond to 80 % degree of confidence and the sample size
n=15.
χ2l= χ l 2 =
χ2r= χ r 2 =

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

(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.

4. bob solved the inequality problem below incorrectly. explain his error and redo the problem showing the correct answer. −2x + 5 < 17 −2x + 5-5 < 17-5 -2x/-2 < 12/-2 x < -6