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# Probability help plsssss

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1. Have completely forgotten how to do these questions, can someone walk me through them pls

Spoiler:
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A new drug treatment is found to increase the survival rate from a certain disease from 50% for those not given the treatment to 75% for those given the treatment. Of a group of 100 patients suffering from the disease, 10 were chosen at random to undergo the treatment.(i) What is the probability that a randomly chosen patient from the group of 100 was given the treatment and survived?(ii) What is the probability that a patient who survived was given the treatment?(iii) What is the probability that a patient who did not survive was given the treatment?
2. (Original post by somemightsay888)
Have completely forgotten how to do these questions, can someone walk me through them pls
Spoiler:
Show
A new drug treatment is found to increase the survival rate from a certain disease from 50% for those not given the treatment to 75% for those given the treatment. Of a group of 100 patients suffering from the disease, 10 were chosen at random to undergo the treatment.(i) What is the probability that a randomly chosen patient from the group of 100 was given the treatment and survived?(ii) What is the probability that a patient who survived was given the treatment?(iii) What is the probability that a patient who did not survive was given the treatment?
One way to help yourself is by drawing a tree diagram.
3. chance that they're given the treatment (10/100) x 75% of survival

OR (+)

the chance that they're not given the treatment which is 90/100 x 50% chance of survival

I think this is what you do?? someone pls correct me

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