The following table shows the expressions that represent the sales of two companies:
company| a | b
sales |110(0.70)x| 430(1.90)x
which company has the largest percent of increase?
company a
company b
both company a and company b
neither company a nor company b

Step-by-step explanation:

Recall that a probability mass function defined on a discrete random variable X is just a function that gives the probability that the random variable equals a certain value k

In this case we have the event  

“The computer will ask for a roll to the left when a roll to the right is appropriate” with a probability of 0.003.

Then we have 2 possible events, either the computer is right or not.

Since we have 4 computers in parallel, the situation could be modeled with a binomial distribution and the probability mass function

This gives the probability that k computers are wrong at the same time.