SOLUTION: If it estimated that 30% of all students who fall under the Business Economics and Management Department at Richfield have a valid driver's license. What is the probability of this

Question 1179350: If it estimated that 30% of all students who fall under the Business Economics and Management Department at Richfield have a valid driver's license. What is the probability of this in a sample of 10 students?
(I) Exactly 4 have a valid driver's license?
(II) At least 2 have a valid driver's license?
(II) More than 9 have a valid driver's licence?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
exactly 4 is 10C4(0.3)^4*(0.7)^6=0.2001
or 2nd VARS binompdf(10,.3,4)
-
at least 2, look at prob of 0 and 1, add them and subtract from 1
p(0)=0.7^10=0.0282
p(1)=10*0.3*0.7^9=0.1211
they add to 0.1493, so the answer is 1-0.1493=0.8507
or 1-binompdf(10,0.3,1), which performs the same calculation.-
more than 9 is all 10, and that is 0.3^10=0.0000059

RELATED QUESTIONS
In a class of 70 students 6 offer Economics only, 18 offer Geography and economics but... (answered by math_tutor2020)

A survey of 48 students at the wall college of business showed the following majors... (answered by stanbon)

A class of 40 students was each required to having the text books in each of economics,... (answered by KMST)

probability a student will pass an economics exam is 1/2 probability the student pass... (answered by Boreal,ikleyn)

a) Two sets P and Q are such that n(P) = 15, n(Q) = 14 and n(P U Q) = 24. Calculate n(P (answered by richwmiller)

In a group of students, 50% of the students were taking statistics subjects, 30%... (answered by ikleyn)

Luke�s luck changed, and he was able to enroll full-time again. He has become employed... (answered by Theo,Shin123)

Textbook Question from Applied Statistics in Business and Economics, by Doane and Seward (answered by stanbon)

1. If σ is unknown when completing a hypothesis test about the population mean,... (answered by stanbon)