N 15. The density for X, the number of holes that can be drilled per bit while drilling into limestone is given in Table 3.13. (a) Find E[X] and E[X²]. Find Var X and ox What physical unit is associated with σx? TABLE 3.13 x 1 02 tub stamaib leis 42. 3 .05 03 2 5 16 .2 7 .07 adt snibart to

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