The probability that a certain kind of component will survive a shock is 0.75. Find the probability
1) exactly two of the next 8 component tested survive.
2) at least two will survive.
Solve it by binomial distribution

Question

The probability that a certain kind of component will survive a shock is 0.75. Find the probability 
1) exactly two of the next 8 component tested survive.
2) at least two will survive. 
Solve it by binomial distribution

amistre64 · Answer

well, what are your attempts?

merchandize · Answer

i have solved the first part. by using binomial distribution equation.
i want to know about second part of it.

amistre64 · Answer

the second part is simpler if you do a complement

amistre64 · Answer

1 - [P(0) + P(1)]

merchandize · Answer

is it sure that we will be subtracting 1

amistre64 · Answer

well the sum of all probabilites is 1, so the complement is subtracted from 1

merchandize · Answer

Thank you so much.

amistre64 · Answer

youre welcome