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4 June, 22:50

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?

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  1. 4 June, 23:36
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    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.
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