The expected value of the random variable x is a. b. the ...

[khang]

The expected value of the random variable x is
 a.
  b. the standard error
  c. the sample size
  d.

Question 2

A manufacturing company has 5 identical machines that produce nails. The probability that a machine will break down on any given day is .1 . Define a random variable x to be the number of machines that will break down in a day.
 a. What is the appropriate probability distribution for x? Explain how x satisfies the properties of the distribution.
  b. Compute the probability that 4 machines will break down.
  c. Compute the probability that at least 4 machines will break down.
  d. What is the expected number of machines that will break down in a day?
  e. What is the variance of the number of machines that will break down in a day?

[Fayaz00962]

Answer to Question 1

d

Answer to Question 2

a. binomial
b. .0004
c. .0004
d. .5
e. .45

[khang]

Gracias!

[Joy Chen]

Thanks for the timely response, appreciate it