https://imgur.com/a/iSUsUPb
I am not sure why it is not P[X<=3|X<=4] if it is P[X<=3|X<=5] aren't they forgetting the value of P[X=4]???
https://imgur.com/a/iSUsUPb
I am not sure why it is not P[X<=3|X<=4] if it is P[X<=3|X<=5] aren't they forgetting the value of P[X=4]???