With reference to the table in question $3,$ determine the following probabilities:

$(1.)$ P$($next week's sales will be high$)$

$(11.)$ P$($next week's sales will be high the competitor advertises $($iii$.)$ P$($next week's sales will be high$|$the competitor does not advertise $($iv$.)$ P$($next week's sales will be low$)$

$($v$.)$ P$($next week's sales will be low the competitor advertises$)$