Question

A cell phone company orders 600 new phones from a manufacturer. If the probability of a phone being defective is 3.5%, predict how many of the phones are likely to be defective. Round to the nearest whole number.

18 phones
26 phones
210 phones
21 phones

Answer 1

to find out how many phones are not defected, 600*96.5%=579 so 600-579 = 21 phones defected. 

Answer 2

3.5% of 600...turn percent to a decimal..." of " means multiply

0.035 * 600 = 21 <=== 21 phones are likely to be defective