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Home > INT3 > Chapter 7 > Lesson 7.2.5 > Problem 7-120

7-120.
  1. A company makes metal plates on which they put a special coating. Flaws appear in the finish of these metal plates and the company wants to establish a quality control system. A machine scans each plate after it is finished and reports the number of flaws. The data they collect for 50 samples is sorted and shown below. Homework Help ✎

    0

    2

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    5

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    11

    13

    1

    2

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    5

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    7

    8

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    11

    13

    1

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    5

    7

    7

    9

    10

    12

    13

    1

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    6

    7

    8

    9

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    12

    14

    2

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    12

    21

    checksum 360

  2. Think about the quality control bounds for this company. Should you reject plates that have too few flaws? What upper and lower bounds make sense?

Reject the upper 10% of the data.