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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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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?

User Stray
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1 Answer

5 votes

Answer is 20

4/110 = 0.0364

X/550 = 0.0364

X= 550 * 0.0364 = 20 cellphone

User Jaapze
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