Answer :
Let H represent hit and M represent miss, Then sample space
MMMM, MMMH, MMHM, MHMM, HMMM, MMHH, MHMH, HMMH, MHHM, HMHM, HHMM, MHHH, HMHH, HHMH, HHHM, HHHH
He hit at least 75% in 5 occasions.
Therefore, P(hit at least 75%) = 5/16
MMMM, MMMH, MMHM, MHMM, HMMM, MMHH, MHMH, HMMH, MHHM, HMHM, HHMM, MHHH, HMHH, HHMH, HHHM, HHHH
He hit at least 75% in 5 occasions.
Therefore, P(hit at least 75%) = 5/16