Answer:
the 1st one and the last one are the answers
Step-by-step explanation:
(X x 6) = (X x 8) -4
Ps. Make sure yoi dont times the (X x 8) by -4 the -4 is by itself.
I personally found it easier thinking if there is a difference of 4 between 6 x X and 8x X then it must be 2x2 as the difference between 6 and 8 is 2. therefore 4 divided by 2 = 2 and 2 x 2 = 4
Therefore x = 2
If you’re rounding up it would be 75. But if you round down 74
Let x be the random variable representing defective phone. Let n be the sample size. Let p be the probability that phone is defective.
Given: n=500, p= 0.02
From given information we know that x is random variable such that p is the probability of success and it is constant for each trial. Sample size n is fixed.
X follows Binomial distribution with parameters n=500 and p=0.02
a). The average number of defective phone
E(x) = n*p = 500 * 0.02 = 10
The average number of defective phones is 10.
b)Probability of getting 5 defective phones.
P(X=5) = 
= 
= 0.037
The probability of getting exactly 5 defective is 0.037.