In a class of 27 students, 10 have a brother and 12 have a sister. There are 4 students who have a brother and a sister. What is the probability that a student who has a sister also has a brother?

4/27 unlikely because there is 27 students and only 4 of them have a sister and a brother

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540