The probability that all six share attacks are non fatal will be 0.02768.
How to solve the probability?
The probability that an attack is non fatal is 55%. Therefore, the probability that all six share attacks are non fatal will be:
= 55%^6
= 0.55^6
= 0.02768
The probability that two or more are fatal will be:
= 0.3025 + 0.166 + 0.0915 + 0.050 + 0.02768
= 0.63768
The expected number of non fatal shark attacks will be:
= 3/6 = 0.5
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