[EX02-098] Better Roads magazine reported the percentage of interstate and state-owned bridges that were structurally deficient or functionally obsolete (%SD/FO) for each U.S. state in 2003. (Percentages are expressed in decimal form

[e.g., 0.20  20%].)

State SD/FO* State SD/FO* State SD/FO*

AK 0.20 AL 0.22 AR 0.20

••• Remainder of data on Student’s Suite CD-ROM Source: Better Roads, November 2003

*SD/FO  structurally deficient or functionally obsolete.

a. Construct a histogram.

b. Does the variable “%SD/FO” appear to have an approximately normal distribution?

c. Calculate the mean.

d. Find the median.

e. Find the range.

f. Find the standard deviation.

(Retain these solutions to use in Exercise 2.125 on p. 105.)