The mean lest score on a given college entrance exam in math

The mean lest score on a given college entrance exam in math is 120 and the standard deviation is 18. The mean for the entrance exam in physics is 145 and the standard deviation is 15. A prospective engineering student scored 136 on the math exam and 158 on the physics exam. Determine the z-scores for each of the student\'s tests. Was her performance better on the math test or the physics test? You may use the normal distribution curve to help you find your answers. Determine by inspection which set has the greater standard deviation. Circle the set with the greater standard deviation and explain how you know. A box has 2 red chips, 2 blue chips, and 1 green chip. Two chips are randomly selected together. List the elements in the sample space. What is the probability of selecting 2 blue chips?

Solution

7)

Set A : Since the difference between max and min is less

8)

a)sample space

{ {R_1,R_2},{B_1,B_2},{R_1,G},{B_1,G},{R_2,G},{B_2,G},{R_1,B_1},{B_1,R_2},{R_1,B_2},{B_2,R_2} }y

b) probability of selecting {B_1,B_2} = 1/10