On a certain day, suppose there are 26 time intervals for Old Faithful. Treating these 26 eruptions as a random sample, there is a 0.20 likelihood that the mean length of time between eruptions will exceed what value?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.