The probability of making his 4th attempt is 0.77, since the probability of each attempt is independent.
The probability of making a field goal over 40 yards is 77%
Since the probability of making a field goal is independent, then the probability of succeeding in his 4th attempt does not depend on his previous attempts.
Hence, the probability of making his fourth attempt is the probability of making a field goal over 40 yards in each attempt which is 77% = 0.77
Hence, the probability of making it is 0.77
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