Every weekday Mr Bullar, a teacher, leaves home early in the hope that his favourite car parking spot is available at school. On average he finds that he gets this spot on one day out of three. Let the random variable X represent the number of days in a working week of 5 days that Mr Bullar parks in his favourite spot.
(a) In order to use a binomial distribution model for X, state one assumption you will need to make.
(b) Calculate the probability that Mr Bullar parks in his favourite spot on at least 2 weekdays in a given week.
There are seven school weeks in the next half term. Mr Bullar thinks it’s a good week if
he parks in his favourite spot on more than one day in the week, otherwise he calls it a bad week.
(c) Calculate the probability that Mr Bullar has more good weeks than bad weeks next Half term.
So
A) we assume that probability of the spot being empty is the same for each day.
B) X-P(5,2/5)
1-P(X=1)-(X=0)
1-0.2592-0.0777=0.66 sf
C) do I draw a tree diagram for C?
Also, for B is my model correct since in the question it says 2 days in a week day.
So I think n would be 7 but Not sure so I put 5.
Can someone help me out😂