Can you me plzz asap on these two questions find (g o f)(x) when f(x)= sqrt x+2 and g(x)=x^2+1/x

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Find the value of x. round the length to the nearest tenth

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?