A:) The table below shows the scores of a group of students on a 10-point quiz.

Test Score	Frequency
3	2
4	3
5	1
6	2
7	1
8	3
9	2
10	1

(a.)The mean score on this test is:

(b.)The median score on this test is:

B:)One hundred teachers attended a seminar on mathematical problem solving. The attitudes of a representative sample of 12 of the teachers were measured before and after the seminar. The differences between their pre-seminar scores and post-seminar scores are shown below.

4

7

5

8

7

0

6

-1

2

-2

1

3

(a) What is the range of the scores? (b) What is the standard deviation of the scores? Round your answer to the nearest tenth, if necessary.

C:)Find the 5 number summary for the data shown

x

2.6

11.3

16.8

17

17.4

24

25.4

5 number summary:

D:)For a standard normal distribution (use the normal table), find: P(z<1.78)P(z<-1.78), the percent of data values that fall below z=1.78.z=-1.78. The normal distribution table gives us an area in decimal form of for below z=1.78.z=-1.78. Converted to percent, the percent of data values that fall below z=1.78z=-1.78 is: P(z<1.78)P(z<-1.78) = %