1. In a set of 80 ACT scores, where the mean is 26 and the standard deviation is 5.39, (a) how many scores are expected to be lower than 20.61 (one standard deviation below the mean)? (b) How many of the 80 scores are expected to be below 36.78 (two standard deviations above the mean)?

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2. The data shows the total number of employee medical leave days taken for on-the-job accidents in the first six months of the year:

12,4,18,6,20,12. Find the sum of squares of the deviations from the mean.

3.The data shows the total number of employee medical leave days taken for on-the-job accidents in the first six months of the year:

20,11,27,13,29,20. Find the standard deviation.