Statistical process control using the means Chart Management of Y. Bee Hear grocery stores chain is concerned about the weekly maintenance costs reported by each of their fifteen stores in Southern Indiana. Each store was built at about the same time following the same blueprint during construction and thus are expected to incur similar maintenance costs. The chain asked you to analyze the situation and provided the following actual costs obtained from the accounting records. The records show costs for each store over a five-week span.

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4 380 369 354 169 236 Store Weekly Maintenance Costs 123456 $250 $245 $260 $255 $290 210 230 225 250 265 195 220 195 185 200 380 345 330 185 190 235 199 229 198 245 7 177 196 212 200 185 8 175 182 189 180 200 9 199 192 200 199 220 10 190 200 192 200 200 210 11 180 190 200 221 225 12 175 182 195 188 200 13 190 230 242 225 195 14 200 200 230 230 240 15 225 228 198 235 230