how many would be expected not to fail when 1,500 TV's go to market?

Question

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?

Answer 1

Hi Sheily,

 

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*.867 = 1300.5 are not expected to fail. Rounding down gives us 1300 TV's.