Chips per Bag In a 1998 advertising campaign, Nabisco claimed that every 18-ounce bag of

Chapter 7, Problem 9

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Chips per Bag In a 1998 advertising campaign, Nabisco claimed that every 18-ounce bag of Chips Ahoy! cookies contained at least 1000 chocolate chips. Brad Warner and Jim Rutledge tried to verify the claim. The following data represent the number of chips in an 18-ounce bag of Chips Ahoy! based on their study. 1087 1098 1103 1121 1132 1185 1191 1199 1200 1213 1239 1244 1247 1258 1269 1307 1325 1345 1356 1363 1135 1137 1143 1154 1166 1214 1215 1219 1219 1228 1270 1279 1293 1294 1295 1377 1402 1419 1440 1514 Source: Chance 12(1): 1014, 1999 (a) Use the following normal probability plot to determine if thedata could have come from a normal distribution.(b) Determine the mean and standard deviation of the sampledata.(c) Using the sample mean and sample standard deviationobtained in part (b) as estimates for the population meanand population standard deviation, respectively, draw agraph of a normal model for the distribution of chips in abag of Chips Ahoy!.(d) Using the normal model from part (c), find the probabilitythat an 18-ounce bag of Chips Ahoy! selected at randomcontains at least 1000 chips.(e) Using the normal model from part (c), determine theproportion of 18-ounce bags of Chips Ahoy! that containsbetween 1200 and 1400 chips, inclusive.