A cell phone company tests 110 cell phones and finds that 4 of them have defects. Out of 550 cell phones, how many would you expect to have defects? A cell phone company tests 110 cell phones and finds that 4 of them have defects. Out of 550 cell phones, how many would you expect to have defects? A cell phone company tests 110 cell phones and finds that 4 of them have defects. Out of 550 cell phones, how many would you expect to have defects? Item 9 A cell phone company tests 110 cell phones and finds that 4 of them have defects. Out of 550 cell phones, how many would you expect to have defects?

You would expect 20 defective cell phones out of 550 cell phones.

Step-by-step explanation:

It is given that,

The cell phone company tests 110 cell phones. Out of 110 cell phones being tested, 4 cell phones are found to be defective.

Therefore, it can be determined that 4 cell phones are defective for 110 cell phones tested.

Now, it was asked to find the number of cell phones that could be defective, if a total of 550 cell phones are tested.

To find the number of defective cell phones in 550 cell phones:

We know that, the rate of defective cell phones is 4 for 110.

Let us assume that, the number of defective cell phones be 'x' for 550.

To find x value:

Use the rate formula,

Rate = No. of defective cell phones / No. of cell phones tested

⇒ 4 / 110 = x / 550

Keep x alone on one side, and cross multiply 550 to the other side.

⇒ x = (550*4) / 110

⇒ x = 20 defectives

'x' is the number of defective cell phones in 550 cell phones tested.

Therefore, you would expect 20 defective cell phones out of 550 cell phones.