Many consumers pay careful attention to stated nutritional contents on packaged foods when making purchases, so it

Question:

Many consumers pay careful attention to stated nutritional contents on packaged foods when making purchases, so it is important that the information on packages be accurate. A random sample of n = 12 frozen dinners of a certain type was selected and the calorie content of each one was determined. Below are the resulting observations, along with a boxplot and a normal probability plot.
255 244 239 242 265 245 259 248 225 226 251 233