Answer:
The expected value of X is 2 with a standard deviation of 1.34.
Step-by-step explanation:
For each speaker, there are only two possible outcomes. Either it is defective, or it is not. The probability of a speaker being defective is independent of other speakers. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
The expected value of the binomial distribution is:

The standard deviation of the binomial distribution is:

Stereo speakers are manufactured with a probability of 0.1 of being defective
This means that 
Twenty speakers are randomly selected.
This means that 
Let the random variable X be defined as the number of defective speakers. Find the expected value and the standard deviation.


The expected value of X is 2 with a standard deviation of 1.34.
Answer:
It is 40% off!
Step-by-step explanation:
Since 50 x 2 is 100, you only have to double both numbers.
100 decreased to 60 is subtracting 40. It is 40% off!
Answer: -2/1 is the slope
Step-by-step explanation: hope this helps<3
Net worth is what is owned minus what is owed
Answer: .0125
Step-by-step explanation: