At a meeting of 100 geniuses, each genius was either a mathematical genius or a musical genius. At least 1 of the
math geniuses is older than age 15. If you were to choose
any 2 geniuses from the group, at least 1 of them would be
younger than 15 years of age. How many of the 100
geniuses are older than 15, and how many are younger than
15?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?

Me i’m stuck on all these questions besides the two bottom ones

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?