P(B)= 9/20 P(A and B)= 9/100 P(A)=?
2 Answers
Explanation:
Assuming events
#"P"(A nn B) = "P"(A) * "P"(B)#
#" "9/100 = "P"(A) * 9/20#
#20/9 * 9/100 = "P"(A)#
#" "20/100="P"(A)#
#" "1/5="P"(A)#
Apr 30, 2018
Explanation:
multiplication rule for probabilities:

hence,
this can be checked by applying the multiplication rule again: