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Statistics S1 question driving me wild!

I have been struggling with this question for the past 20 minutes for some reason. I bet the answer is going to be so simple :frown: , can you help?

Question: Joe Sleepwell misses lectures by oversleeping. Probability that he oversleeps is 0.6. Find the probability that in e ten week term with two lectures a week, he misses more than half of them.

Any help would be appreciated.
Reply 1
Avatar for Phil_Waite
Phil_Waite
5
Original post by wavey93
I have been struggling with this question for the past 20 minutes for some reason. I bet the answer is going to be so simple :frown: , can you help?

Question: Joe Sleepwell misses lectures by oversleeping. Probability that he oversleeps is 0.6. Find the probability that in e ten week term with two lectures a week, he misses more than half of them.

Any help would be appreciated.


There are 20 lectures in total. You just need to use the binomial distribution with n=20 and p=0.6 to find P(X>10).
Reply 2
Avatar for ttoby
ttoby
15
Assuming that each lecture is independent (i.e. if two lectures were on the same day then they wouldn't be independent) then you can model the number of missed lectures by a binomial distribution. The value of p would be 0.6 and n would be 2*10=20, the total number of lectures.

You would need to get your required probability using cumulative binomial tables.
Reply 3
Avatar for anil10100
anil10100
0.8725
Reply 4
Avatar for wavey93
wavey93
OP
13
Original post by Phil_Waite
There are 20 lectures in total. You just need to use the binomial distribution with n=20 and p=0.6 to find P(X>10).


thank you so much!

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