Can you help me to find the......

1. Mean
2. Median
3. Standard Deviation

Note: the first image shows the formula of Skweness, while the second image is the question.

A survey of 18 high-tech firms showed the number of days' inventory they had on hand. Determine if the data are approximately normally distributed. 5 29 34 44 45 63 68 74 74 81 88 91 97 98 113 118 151 158 DETERMINING THE NORMALITY Skewness can be checked by using the Pearson Coefficient of skewness. 3(x - X) sk = S where x - mean S - standard x - median deviation If -1 2 sk > 1, it can be concluded that the data are significantly skewed