Which mean, Stondord deviation, and xVOlue corresponds to o of 3? a.) x-value = 79 mean = 70 o standard dev'.atlcn 9 b.) I-value = 70 mean 40 o standard dewatjcn 10 c.) I-value = 21 mean 21 o standard dev.atjcn 7 d.) I-value = 40 mean 50 O standard dewatjcn 5