A6. The following table shows the distribution of the total sales (E) of a random sample of 75 'Fosta' coffee shops in the first quarter of 2021. Summary Statistics Total Sales (E) of 'Fosta' coffee shops in the first quarter of 2021 First (or Lower) Quartile 114,776 Mean 227,903 Standard deviation 79,857 Third (or Upper) Quartile 374,645 (a) Calculate the interquartile range (IQR) of the distribution of the total sales (E) of 'Fosta' coffee shops in the first quarter of 2021. (b ) Interpret the mean and standard deviation in relation to the given question. (c) Given that the coefficient of skewness of the distribution of the total sales (E) of 'Fosta' coffee shops in the first quarter of 2021 is equal to - 0.457, comment on the symmetry of this distribution