There are 7 Rounds in a Little League Draft. The probability of drafting a starter in the first three rounds is .55. In the 4th round, the probability of drafting a starter drops to .35. In the 5th, 6th, and 7th rounds of the draft, the probability of drafting a starter drops to .25.
What is the probability that a team will draft at least 4 starters in this draft?