What is the probability that between 970 and 990 of these intervals contain the corresponding value of μ? [hint: let y = the number among the 1000 intervals that contain μ. what kind of random variable is y? ] (round your answer to four decimal places.)

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap