If the failure rate of TVs is 133 how many would be expected

If the failure rate of TVs is 13.3%, how many would be expected not to fail when 1,500 TV\'s go to market?

Solution

solution

failure rate is 13.3%

Assuming the failure rate of TV\'s are mutually independent, we can say that 13.3% of TV\'s are expected to fail, and 100% - 13.3% = 86.7% of the TV\'s are not expected to fail.

If 1,500 TV\'s go to market,

86.7% of them, or 1500*0.867 = 1300.5 are not expected to fail.

Rounding down gives us 1300 TV\'s.