00497pamaa2200181 4500 0000012928 20060227090000.0 0273026968/0712123253 519.5 THI 1981 HA29 THI 1981 THIRKETTLE Wheldon's business statistics and statistical method G.L. Thirkettle. 9th ed. London: ELBS/Pitman, 1981. ix, 278p.: 22cm. Statistics Commercial statistics Wheldon's