Find the probability that when a couple has two children, at least one of them is a boy. (assume that boys and girls are equally likely.)

Part of the total score for each program is the sum of five program component scores. on the free program, the sum of these five program component scores is multiplied by a factor of 2.0. yuzuru hanyu, of japan, earned scores of 9.07, 8.96, 8.89, 9.21, and 9.36 for the program components portion of his free program. how many total points did he receive for this portion?

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120

Astock has a 25% probability of increasing by $10 and a 75% probability of decreasing by $5. what is the stocks expected increase or decrease?