Chapter 8, Problem 49P

Use the following information to answer the next 13 exercises: The data In Table 8.10 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let X = the number of colors on a national flag.

X	Freq.
1	1
2	7
3	18
4	7
5	6

Table 8.10

49. Calculate the following:

a.x

¯ =____; _

b. $s_x=$c. $n=\_\_\_$