1. Calculate the range, mean deviation and standard deviation of the following samples:

   (a) 12, 7, 3, 20, 33, 2, 12

   (b) 12, 15, 23, 7, 12, 40, 22, 16

   (c) 5, 0, 7, 7, 13, 16, 9

2. The accompanying data indicate the semi-monthly amounts (in pesos) invested by a sample of 50 teacher employees in a profit sharing plan:

Amount Invested	Number of Employees
450 499 400 449 350 399 300 349 250 299 200 - 249	5 11 14 8 5 7
Total	50

Compute and interpret the following:

(a) Variance

(b) Standard Deviation