Question

A factory makes car batteries. The probability that a battery is delective is 1/ 11 If 500 batteries are tested, about how many are expected to be defective? OA. 11 O B. 45O C. 489 OD. 30

Answer 1

Solution

For this case the expected value is given by:

$E(x)=np$

And replacing n = 500 and P = 1/11 we got:

E(x)= 500 * 1/11= 45.45

Then the best answer would be:

B. 45