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Probability maths

The probability that a patient recovers from a disease is 0.8. Suppose 20 people are known to have contracted this disease. What is the probability that exactly 14 survive.

Reply 1

ClayJensen817

14C20 × (0.8)^14 × (0.2)^6

Use your calculator to find it

Reply 2

ghostwalker

Original post by ClayJensen817

14C20 × (0.8)^14 × (0.2)^6

Use your calculator to find it

Think you mean 20C14 there, rather than 14C20.

Reply 3

ClayJensen817

Original post by ghostwalker

Think you mean 20C14 there, rather than 14C20.

Yes, sorry

Reply 4

username5129378

Original post by niki_2830

The probability that a patient recovers from a disease is 0.8. Suppose 20 people are known to have contracted this disease. What is the probability that exactly 14 survive.

you want to find P ( X = 14) with variable X ~ B (20, 0.8)
type this into your calculator using binomial PD function (I'm assuming you have access to the casio classwiz calculator)

(edited 4 years ago)

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