Answer :
Answer:
0.8417
Step-by-step explanation:
The probability that a college student uses Twitter for social networking is [tex]p=0.92,[/tex] then the probability that a college student does not use Twitter for social networking is [tex]q=1-p=1-0.92=0.08.[/tex]
9 students are chosen at random.
Use the binomial probability formula to find the probability that 8 use Twitter:
[tex]C^9_8p^8q^{9-8}=9\cdot (0.92)^8\cdot (0.08)^1\approx 0.3695[/tex]
Use the binomial probability formula to find the probability that 9 use Twitter:
[tex]C^9_9p^9q^{9-9}=1\cdot (0.92)^9\cdot (0.08)^0\approx 0.4722[/tex]
The probability that more than 7 students use Twitter is
[tex]0.3695+0.4722=0.8417[/tex]