Mass does not vary from place to place why?

Which object is most likely represented by a dot?

You are an astronaut working on the international space station. accidentally, you let go of the handhold and drift off towards earth. the illustration, below, includes the details of your position (not drawn to scale). i’m a little stuck on the gravitational force felt by the astronaut from the iss. a little ?

Suppose that the life expectancy of a certain brand of nondefective light bulbs is normally distributed, with a mean life of 1100 hr and a standard deviation of 100 hr. if 80 comma 000 of these bulbs are produced, how many can be expected to last at least 1100 hr