A survey from sigma research found out that 30% of IUCG students receive their spending money at the beginning of the academic session.if five students are selected at random,find the probability that at least three of them received their spending money at the beginning of the session.
Which of the following are binomial experiments or can be reduced to binomial experiments?
I.surveying 100 aspiring students to determine if they are interested in pursuing their tertiary education at IUCG.
ii.tossing a coin a 100 times to see how many heads occur.
III.Testing four different cars to see which brands are effective.
iv.Asking 100 people if they drink alcohol.
v.Testing a brand of car using 100 people to determine whether it is effective.
prob(get money) = .3
prob(not get money) = .7
prob(at least 3 of 5 get money)
= C(5,3)(.3)^3 (.7)^2 + C(5,4)(.3)^4 (.7) + .3^5
= ..
you do the button-pushing