Can someone help me find the slope it’s timing me

How do you convert 1.27 to a percentage

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

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?