I think it’s B I’m not sure about it but I hate wan I gat it wrong.
Answer:
a) The probability that at least 5 ties are too tight is P=0.0432.
b) The probability that at most 12 ties are too tight is P=1.
Step-by-step explanation:
In this problem, we could represent the proabilities of this events with the Binomial distirbution, with parameter p=0.1 and sample size n=20.
a) We can express the probability that at least 5 ties are too tight as:

The probability that at least 5 ties are too tight is P=0.0432.
a) We can express the probability that at most 12 ties are too tight as:

The probability that at most 12 ties are too tight is P=1.
2/3 is the answer.
<span>1/3 is equal to 33.33333333% </span>
<span>so 2/3 is equal to 66.6666666%</span>
Multiply 9 by 2a and 2, and you get 18a + 18. Another equivalent expression would be 18(a+1), which you can get by factoring the above answer.
#2) 435+25x=875-15x
40x=440
x=11
the answer is 11 weeks.
#3) 2500(3x) for x=10
2500(3*10)
2500(30)
7500
the answer is 7500 bacteria after 10 months.