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(Solved): 20 Shots Are Fired Independently At One Target. Every Single Shot Hits The Target With A Probability...

20 shots are fired independently at one target. Every single shot hits the target with a probability of 0.8.
We are looking for the probability that
a) exactly 4 hits are scored,
b) at least one goal is scored,
c) a maximum of 6 hits are scored.
Which distribution is to be used? Give the expected value of the corresponding random variable. on!

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