Given the following frequency table for a continuous random variable, Y

y f_j

20 - 40 10

40 - 60 15

60 - 80 10

80 - 100 5

By completing the above table (i.e., showing your work),

1. the estimate sample average of Y (to 2 decimal places) is _____________

1. the estimated sample variance (to 2 decimal places) is _______________