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.

A) 18 phones
B) 210 phones
C) 21 phones
D) 26 phones

Answer 1

To calculate percetages, move the decimal point 2 places to the left.

3.5% = 0.035

Then multiply by the decimal: 

600 • 0.035 = 21

Your answer is C: 21 phones