Question

If is estimated that 30% of all students who fall under the Business Economics and Management department at Richfield have drivers licence. What is the probability of this in a sample of 10 students

Exactly 4 students have drivers license

Answer 1

$n=10, p=0.3,q=1-0.3=0.7$

Probability Exactly 4 students have driver license

$=^{10}C_4p^4q^{10-4}\\ =^{10}C_4(0.3)^4(0.7)^6=0.20$