A fast food chain advertises that their large bag of French fries has a weight of 150 grams.  Some high school students, who enjoy French fires at every lunch, suspect they are getting less than the advertised amount. With a scale borrowed from their physics teacher, they weigh a random sample of 15 bags.  If the sample mean is 145.8 g and the standard deviation is 12.81 g, and the distribution is unimodal and nearly symmetric, is there enough evidence to conclude that the mean weight is below 150 g? Use α = 0.10.

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