Answer:
I think its A. not sure though sry
Step-by-step explanation:
Answer:
5%
Step-by-step explanation:
(240-252/240)×100
Answer:
0.980
Step-by-step explanation:
The probability that the noise level of a wide-band amplifier will exceed 2 dB is 0.05
So, probability of success = 0.05
Probability of failure = 1-0.05=0.95
There are 12 amplifiers
We are supposed to find the probability that at most two will exceed 2dB.
We will use binomial distribution
Formula : 
p = 0.05
q = 0.95
n = 12
We are supposed to find the probability that at most two will exceed 2dB.
So, 



Hence the probability that at most two will exceed 2dB is 0.980
72/9 is equivalent to 8/1
so, option A is your answer.
I believe,
since... slope = (y2-y1)/(x2-x1)
so... slope = (-1+5)/(-1-2)
slope = (4)/(-3) or.. -.75