1.24 The air sulfur dioxide levels recorded in 67 counties of Alabama in 1999 (http://www.epa.gov/

air/airtrends/) are listed here:

2,447 1,586 410 177 423 90 486 2,230 502 213 454 4,073 1,494 135 119 634 70,727 255 140 599 156 926 591 3,131 681 470 24,963 11,747 284 543 253 57,138 143 179 1,888 47,204 82,789 163 1,331 2,274 1,364 931 176 206 4,778 2,028 423 1,504 91,311 2,620 6,126 10,708 203 207 6,760 205 2,414 1,031 106,774 807 11,874 628 5,070 98,705 25,940 2,549 290 a Construct a histogram for these data.

b Calculate the mean and standard deviation for these data.

c Calculate the median and IQR for these data.

d Describe the shape center and spread of these data using the results of part

(a) and either part

(b) or part (c), whichever you think most appropriate.