(b) To find the proportion of the Number of Stores within +1 standard deviation of the mean, calculate the following: (ut0)3(310.24t 308.686) = (310.24-308.686, 310.24 +308.686) %3D =(1.55,618.92) %3D Number of observations lying in the interval (1.55, 618.92)= 44 Total number of observations =51 Proportion of the Number of McDonald's Stores within +1 standard deviation of the mean 44 =x100% 51 %3! =86.27%

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