Plz help asap plzz plllz

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

Can someone me i’m confused. will give brainliest and a whole bunch of points

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.