A restraurant owner estimates that his restaurant will sever 430 customers the first week it is open the actual number of customers the first week is 400 find the percent error

7.5% error

Step-by-step explanation:

Percent Error = ( | measured - real | / real ) x 100%

|430 - 400| / 400 = |-30| / 400

( 30 / 400 ) x 100%

= 7.5%

0.015 is the probability that the pumping system will fail.

Step-by-step explanation:

Given:

There are 2 parallel pumps.

Probability of failing of old pump = 0.10

Probability of failing of new pump = 0.15

Let A be the event that old pump fails, So P(A) be the probability of failing of old pump.

P(A) = 0.10

Let B be the event that newer pump fails, So P(B) be the probability of failing of newer pump.

P(B) = 0.15

It is given that failing of newer and older pumps are independent events.

These events A and B are independent events, happening of one event does not effect the happening of other.

The probability that the system will fail i.e. both the pumps will fail is 0.015.